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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ 1.7	$ (33.3)	$ (1.0)	$ (20.9)
Tax	0.4	0.3	3.8	(1.3)
Other comprehensive income (loss)	2.1	(33.0)	2.8	(22.2)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	0.8	1.1	0.2	2.2
Tax	0.2	(0.3)	1.3	(0.7)
Other comprehensive income (loss)	1.0	0.8	1.5	1.5
Unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(1.0)	(4.4)	(1.5)	(2.6)
Tax	0.1	1.4	0.1	1.3
Other comprehensive income (loss)	(0.9)	(3.0)	(1.4)	(1.3)
Unrealized gain (loss) on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1.9	(30.0)	0.3	(20.5)
Tax	0.1	(0.8)	2.4	(1.9)
Other comprehensive income (loss)	$ 2.0	$ (30.8)	$ 2.7	$ (22.4)

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