| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net Cash Provided by (Used in) Operating Activities [Abstract] | | | | | | | | |
| Net Income (Loss) Attributable to Noncontrolling Interest | -26.1 | -13.2 | -334.4 | -46.7 | -263.0 | 162.2 | 6.7 | -6.5 |
| |
| Adjustments to reconcile net loss to net cash from (used in) operating activities: | | | | | | | | |
| Depreciation and amortization | 47.2 | 46.2 | 45.7 | 44.9 | 43.0 | 52.4 | 50.7 | 33.0 |
| Amortization of debt issuance costs and discount | 1.4 | 1.4 | 15.7 | 4.8 | 4.8 | 4.3 | 4.2 | 1.8 |
| Impairments of property, plant and equipment | | | | | | | | |
| Loss on extinguishment of debt and write-off of debt issuance costs | | | | | | | | |
| Share of net income from joint venture, net of cash dividends received | -0.3 | -6.3 | -3.6 | -1.7 | 0.6 | -1.3 | -2.2 | -3.7 |
| Share-based compensation expense | 4.4 | 3.2 | 4.2 | | | | | |
| Deferred income taxes | -1.8 | -4.8 | -21.7 | -3.1 | -22.4 | 23.2 | -15.5 | -19.1 |
| Other | -3.2 | -2.6 | -4.7 | 3.2 | 1.3 | 0.1 | 0.3 | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | -4.9 | 13.7 | 10.8 | 1.3 | -3.5 | -11.4 | -18.5 | -2.5 |
| Inventories | -6.7 | -13.0 | 5.1 | 1.4 | -16.2 | -8.9 | 4.4 | -1.8 |
| Accounts payable | 8.6 | 0.3 | -8.6 | -7.9 | 2.7 | -4.1 | | -8.0 |
| Income taxes receivable and payable, net | -1.5 | -4.5 | -0.6 | -5.3 | 39.6 | 124.4 | | 2.6 |
| Other | -4.1 | -2.8 | 11.3 | 4.7 | -0.5 | -1.6 | | 3.4 |
| Net cash provided by (used in) operating activities | 7.7 | 15.6 | 15.5 | 49.2 | 40.9 | -28.2 | 69.4 | 33.3 |
| |
| Cash flows from investing activities | | | | | | | | |
| Acquisition of property, plant and equipment | -18.0 | -18.2 | -23.8 | -54.0 | -64.0 | -43.7 | -43.8 | -38.6 |
| Proceeds from sale of property, plant, and equipment | 0.5 | 1.4 | 3.3 | 7.3 | 1.4 | 0.6 | | 3.0 |
| |
| Cash paid for post-closing adjustments on sale of business | | | | | | | | |
| Cash settlements of interest rate swap | | | | | | | | |
| Other | | | | | | | | |
| Net cash used in investing activities | -17.5 | -36.1 | 719.3 | -39.4 | -461.3 | 282.5 | -41.2 | -665.8 |
| |
| Cash flows from financing activities | | | | | | | | |
| Proceeds from long-term debt | 46.0 | 171.0 | 66.2 | 54.2 | 311.8 | 322.0 | 44.0 | 885.0 |
| Repayments of long-term debt | -48.0 | -93.7 | -776.3 | -108.2 | -290.7 | -314.3 | -55.0 | -401.4 |
| |
| Proceeds from issuance of preferred stock | | | | | | | | |
| Redemption of preferred stock | | | | | | | | |
| Dividends paid | | | | | | | | |
| Cash paid for debt issuance costs | | | | | | | | -35.2 |
| Proceeds from short-term debt, net | | -1.6 | -0.9 | -12.6 | 10.3 | -4.2 | -0.5 | -0.1 |
| Other | -3.1 | -5.2 | -3.1 | -3.7 | -4.1 | 1.4 | 1.5 | |
| Net cash provided by (used in) financing activities | -5.2 | 2.6 | -714.9 | 5.3 | 215.1 | -45.8 | -24.5 | 611.6 |