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Other Comprehensive Loss - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ (0.9)	$ (19.0)
Tax	(2.9)	3.3
Net of Tax	(3.8)	(15.7)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.1	0.7
Tax	0.6	(0.2)
Net of Tax	1.7	0.5
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	4.5	(15.6)
Tax	(0.1)	2.9
Net of Tax	4.4	(12.7)
Unrealized (loss) gain on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(6.5)	(4.1)
Tax	(3.4)	0.6
Net of Tax	$ (9.9)	$ (3.5)

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