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Other Comprehensive (Loss) Income - Changes in Components of Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ (16.7)	$ 7.7	$ (7.8)	$ (10.8)
Tax	(0.9)	1.1	(4.2)	5.2
Other comprehensive (loss) income	(17.6)	8.8	(12.0)	(5.6)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.1	1.1	3.4	2.9
Tax	(0.2)	(0.3)	0.0	(0.8)
Other comprehensive (loss) income	0.9	0.8	3.4	2.1
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	2.3	1.1	6.1	(14.3)
Tax	(0.6)	(0.3)	(0.8)	2.3
Other comprehensive (loss) income	1.7	0.8	5.3	(12.0)
Unrealized (loss) gain on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(20.1)	5.5	(17.3)	0.6
Tax	(0.1)	1.7	(3.4)	3.7
Other comprehensive (loss) income	$ (20.2)	$ 7.2	$ (20.7)	$ 4.3

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