CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Consolidated Statement of Comprehensive Income [Abstract] | |||||||||||
| Net (loss) income | $ (77.2) | $ 44.2 | $ (20.0) | $ 41.7 | $ 53.3 | $ 195.1 | $ 58.6 | $ 20.9 | $ (11.3) | $ 327.9 | $ 549.5 |
| Other comprehensive (loss) income, net of tax: | |||||||||||
| Foreign currency translation adjustments, net | (9.1) | (22.2) | 31.7 | ||||||||
| Unrealized losses on derivative contracts, net | (15.4) | (11.7) | (1.7) | ||||||||
| Pension and postretirement liability adjustments, net | (150.2) | (74.9) | (21.6) | ||||||||
| Amortization of prior service costs and actuarial losses, net | 22.3 | 28.3 | 17.0 | ||||||||
| Total other comprehensive (loss) income, net of tax | (152.4) | (80.5) | 25.4 | ||||||||
| Comprehensive (loss) income | $ (163.7) | $ 247.4 | $ 574.9 | ||||||||