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Other Comprehensive Loss - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ 7.7	$ (12.4)	$ (10.8)	$ (13.4)
Tax	1.1	(1.0)	5.2	2.8
Other comprehensive income (loss)	8.8	(13.4)	(5.6)	(10.6)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.1	0.7	2.9	0.9
Tax	(0.3)	(0.6)	(0.8)	0.7
Other comprehensive income (loss)	0.8	0.1	2.1	1.6
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.1	(4.1)	(14.3)	(5.6)
Tax	(0.3)	1.1	2.3	1.2
Other comprehensive income (loss)	0.8	(3.0)	(12.0)	(4.4)
Unrealized gain (loss) on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	5.5	(9.0)	0.6	(8.7)
Tax	1.7	(1.5)	3.7	0.9
Other comprehensive income (loss)	$ 7.2	$ (10.5)	$ 4.3	$ (7.8)

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