Accumulated Other Comprehensive Loss Components (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	$ (186.8)
Other comprehensive income (loss) before reclassifications	7.5
Amounts reclassified out	0.3
Other comprehensive income, net of tax	7.8	$ 14.6
Balance, ending	(179.0)
Gains (Losses) on Cash Flow Hedges [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(3.2)
Other comprehensive income (loss) before reclassifications	1.4
Amounts reclassified out	0.3
Other comprehensive income, net of tax	1.7
Balance, ending	(1.5)
Unrealized Gains on Investment Securities [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	5.2
Other comprehensive income (loss) before reclassifications	0.3
Amounts reclassified out	0.0
Other comprehensive income, net of tax	0.3
Balance, ending	5.5
Defined Benefit Pension and Other Postretirement Plans [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(45.4)
Other comprehensive income (loss) before reclassifications	(0.1)
Amounts reclassified out	0.0
Other comprehensive income, net of tax	(0.1)
Balance, ending	(45.5)
Foreign Currency Translation [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(143.4)
Other comprehensive income (loss) before reclassifications	5.9
Amounts reclassified out	0.0
Other comprehensive income, net of tax	5.9
Balance, ending	$ (137.5)