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Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ 7.9	$ 0.5	$ 8.9	$ (18.5)
Tax	1.5	0.8	(3.3)	4.1
Net of Tax	9.4	1.3	5.6	(14.4)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.2	1.1	2.3	1.8
Tax	(0.4)	(0.3)	0.2	(0.5)
Net of Tax	0.8	0.8	2.5	1.3
Unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(2.6)	0.2	3.8	(15.4)
Tax	1.8	(0.3)	(0.2)	2.6
Net of Tax	(0.8)	(0.1)	3.6	(12.8)
Unrealized gain (loss) on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	9.3	(0.8)	2.8	(4.9)
Tax	0.1	1.4	(3.3)	2.0
Net of Tax	$ 9.4	$ 0.6	$ (0.5)	$ (2.9)

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