Accumulated Other Comprehensive Loss Components (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	$ (154.2)
Other comprehensive income (loss) before reclassifications	1.2
Amounts reclassified out	(0.4)
Other comprehensive income, net of tax	0.8	$ 21.5
Balance, ending	(153.4)
Gains (Losses) on Cash Flow Hedges [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(0.4)
Other comprehensive income (loss) before reclassifications	(3.0)
Amounts reclassified out	(0.3)
Other comprehensive income, net of tax	(3.3)
Balance, ending	(3.7)
Unrealized Gains on Investment Securities [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	0.4
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified out	0.0
Other comprehensive income, net of tax	0.0
Balance, ending	0.4
Defined Benefit Pension and Other Postretirement Plans [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(40.4)
Other comprehensive income (loss) before reclassifications	(0.2)
Amounts reclassified out	(0.1)
Other comprehensive income, net of tax	(0.3)
Balance, ending	(40.7)
Foreign Currency Translation [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(113.8)
Other comprehensive income (loss) before reclassifications	4.4
Amounts reclassified out	0.0
Other comprehensive income, net of tax	4.4
Balance, ending	$ (109.4)