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Accumulated Other Comprehensive Income (Loss) - Reclassification of Other Comprehensive Income (Loss) Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Amount of gain (loss) recognized in OCI on derivatives $ (6.9) $ (4.0) $ 1.0
Actuarial loss (7.7) 5.3 (4.9)
Impact of reclassification adjustment to interest expense included in Net Income (Loss) 1.0 (0.1) 0.0
Amortization of net loss included in net periodic benefit cost 2.5 4.0 4.6
Prior service cost (0.1) 0.0 0.0
Amortization of defined benefit pensions items reclassified to net periodic pension cost: Prior service credit 0.0 (0.7) (0.7)
Curtailment (gain)/loss 0.0 (1.4) (0.6)
Settlement (gain)/loss 0.0 0.0 0.1
Total before income tax (11.2) 3.1 (0.5)
Income taxes 0.0 0.0 0.0
Other comprehensive income (loss), net of tax $ (11.2) $ 3.1 $ (0.5)