| In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income (loss) | -73.7 | -70.5 | 34.9 | 49.3 | 37.2 | 46.3 | 21.8 | 19.2 |
| Adjustments to reconcile net income (loss) to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization | 55.0 | 49.0 | 33.2 | 26.1 | 19.6 | 17.3 | 17.6 | 12.7 |
| Amortization of debt issuance costs | | | | | 2.0 | | 2.1 | |
| Impairment of goodwill and long-lived assets | 61.1 | 64.2 | | 0.8 | | 1.4 | | |
| Deferred income taxes | -4.4 | -14.6 | 0.6 | -2.9 | -1.2 | 3.6 | -1.5 | 1.0 |
| Employee benefit plans settlement expenses | 0.4 | 25.2 | | | | | | |
| Stock-based compensation | 3.5 | 2.8 | 2.1 | 4.3 | 4.4 | 2.8 | 2.8 | 1.8 |
| (Gain) loss on disposition of property, plant and equipment | 0.2 | 0.0 | 0.2 | | | | 0.2 | 0.4 |
| (Gain) loss from equity method investment | 0.0 | -0.1 | -0.1 | 0.0 | -0.1 | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | -11.7 | 37.5 | -7.1 | -8.0 | 0.4 | -2.7 | -7.2 | -4.1 |
| Contract assets | -3.6 | -5.5 | -3.8 | | | | | |
| Inventories | 3.9 | 2.6 | -6.0 | -11.1 | 0.5 | 0.5 | 4.5 | -3.0 |
| Income taxes (receivable) payable | -3.1 | -0.9 | 3.2 | -1.2 | 1.2 | -0.3 | -4.1 | -0.6 |
| Prepaid expenses and other assets | 0.2 | 2.0 | -0.5 | -0.8 | -3.4 | -1.3 | -2.3 | 0.2 |
| Accounts payable | 26.2 | -0.4 | -5.1 | 14.3 | 3.5 | -4.9 | 1.2 | -0.1 |
| Accrued taxes payable | 2.3 | 2.5 | 0.5 | -4.7 | 1.2 | -0.2 | | |
| Benefit plan liabilities | -1.9 | -4.3 | -7.7 | | | | | |
| Other, net | 2.4 | -1.5 | -2.9 | -1.0 | 1.1 | 0.1 | 1.8 | 3.8 |
| Net cash provided by (used for) operating activities | 74.2 | 86.9 | 44.7 | 62.9 | 69.7 | 36.1 | 41.6 | 30.3 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Capital expenditures | -33.4 | -35.9 | -31.3 | -27.0 | -25.5 | -20.6 | -14.0 | -13.8 |
| Payments from divestitures | | 0.9 | -270.0 | -0.3 | -152.2 | | -79.4 | |
| Proceeds from the sale of property, plant and equipment | 0.0 | 0.3 | 0.3 | | | | | |
| Net cash provided by (used for) investing activities | -27.6 | -32.4 | -301.0 | -27.3 | -177.7 | 7.9 | -93.5 | -14.0 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from borrowings | 20.0 | | 338.0 | | 116.6 | | 60.0 | |
| Debt repayments | -22.0 | -52.2 | -89.9 | -51.8 | -10.3 | -20.6 | -20.6 | -0.8 |
| Common stock issued | 2.2 | 0.4 | 0.9 | 1.3 | 1.2 | 1.5 | 2.5 | 1.5 |
| Common stock repurchased | -0.3 | -0.1 | -1.0 | -2.8 | -1.1 | -8.7 | -0.7 | -6.6 |
| Net cash provided by (used for) financing activities | -0.1 | -51.9 | 247.5 | -53.2 | 106.4 | -26.7 | 42.5 | -5.6 |
| Effect of exchange rate changes on cash | 4.4 | -0.5 | -1.9 | 5.5 | | | | |