| 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 loss | -22.1 | -50.3 | -73.8 | -21.0 | -37.0 | -40.5 | -138.1 | -146.6 |
| |
| Reconciliation of net loss to cash provided by operating activities: | | | | | | | | |
| Depreciation and amortization | 78.2 | 78.2 | 80.5 | 76.7 | 70.5 | 69.1 | 72.1 | 81.8 |
| Provision (benefit) for deferred income taxes | 0.4 | -0.6 | 0.2 | 0.1 | -0.2 | 0.8 | 0.0 | -0.6 |
| Equity compensation expense | 1.3 | 2.0 | 1.4 | 1.1 | 0.6 | 1.2 | 3.0 | 2.2 |
| Provision (recovery) for doubtful accounts | -0.4 | 0.4 | 1.2 | | | 1.0 | 1.7 | 0.5 |
| Amortization of deferred financing costs | 0.3 | 1.4 | 2.6 | 2.6 | 6.1 | 3.2 | 2.7 | 2.8 |
| Other non-cash charges and credits | 0.1 | 0.2 | -0.7 | 0.1 | 0.6 | 0.6 | 1.6 | 0.8 |
| Gain on sale of property, plant, and equipment | -1.0 | 4.0 | -1.7 | -0.7 | -0.2 | -0.3 | -0.5 | -0.2 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | -12.3 | -6.4 | 18.9 | -2.1 | -19.3 | -2.7 | 11.2 | 19.7 |
| Inventories | -17.6 | -7.8 | 13.2 | -0.3 | -23.5 | -10.8 | 10.5 | 64.9 |
| Prepaid expenses and other current assets | 3.8 | -1.7 | -1.2 | 1.4 | -2.2 | -0.5 | 1.7 | -2.8 |
| Accounts payable and accrued expenses | 4.3 | 3.8 | -45.7 | 1.8 | 29.8 | 15.8 | -17.0 | -71.6 |
| Other | 0.3 | -0.9 | -0.4 | -1.2 | -1.3 | -0.4 | 0.1 | -0.3 |
| Net cash provided by operating activities | 35.5 | 27.2 | 20.8 | 67.7 | 30.1 | 39.1 | 61.4 | 101.9 |
| |
| Investing activities: | | | | | | | | |
| Purchases of property, plant, and equipment, net | -52.1 | -43.4 | -14.7 | -75.8 | -104.0 | -28.0 | -10.7 | -95.3 |
| Proceeds from sale of property, plant, and equipment | 8.1 | 1.3 | 19.4 | 11.0 | 0.5 | 2.8 | | |
| Net cash used in investing activities | -43.9 | -40.5 | 5.2 | -64.2 | -103.5 | -22.8 | -10.7 | -95.3 |
| |
| Financing activities: | | | | | | | | |
| Proceeds from long-term debt | 115.5 | 51.5 | 411.1 | 45.0 | 380.0 | 80.9 | 109.0 | 63.0 |
| Payments of long-term debt | -113.4 | -95.1 | -413.1 | -41.6 | -258.0 | -74.9 | -172.9 | -23.0 |
| Distributions | -5.7 | -1.9 | | | | | | |
| Equipment financing lease, net | | | | 14.8 | | | | |
| Other financing activities | -0.3 | -0.6 | -5.0 | -1.4 | -9.0 | -2.3 | -1.7 | |
| Net cash (used in) provided by financing activities | 10.3 | 3.4 | -11.7 | -17.0 | 81.7 | -29.3 | -39.9 | -28.4 |
| Effect of exchange rate changes on cash | 0.0 | 0.0 | | | | | | |
| |
| Supplemental cash flow information: | | | | | | | | |
| Interest paid | 47.3 | 49.2 | 49.8 | 47.8 | 38.6 | 31.7 | 32.9 | 33.0 |
| Income taxes paid | 6.6 | 4.3 | 2.7 | 3.1 | 2.1 | 3.0 | 1.3 | 0.6 |
| Decrease (increase) in accrued capital expenditures | -4.2 | 0.8 | | | | | | |