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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ (2.7)	$ 12.4
Tax	3.4	(1.6)
Other comprehensive income	0.7	10.8
Unrealized gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(0.6)	1.1
Tax	1.1	(0.4)
Other comprehensive income	0.5	0.7
Unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(0.5)	1.8
Tax	0.0	(0.1)
Other comprehensive income	(0.5)	1.7
Unrealized (loss) gain on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(1.6)	9.5
Tax	2.3	(1.1)
Other comprehensive income	$ 0.7	$ 8.4

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