Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	$ (119.2)
Other comprehensive income (loss) before reclassifications	(51.8)
Amounts reclassified out	0.7
Other comprehensive (loss) income, net of tax	(51.1)	(1.4)
Balance, ending	(170.3)
Gains (Losses) on Cash Flow Hedges [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(4.3)
Other comprehensive income (loss) before reclassifications	3.3
Amounts reclassified out	0.1
Other comprehensive (loss) income, net of tax	3.4
Balance, ending	(0.9)
Unrealized Gains on Investment Securities [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	4.7
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified out	0
Other comprehensive (loss) income, net of tax	0
Balance, ending	4.7
Defined Benefit Pension and Other Postretirement Plans [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(64.6)
Other comprehensive income (loss) before reclassifications	1.2
Amounts reclassified out	0.6
Other comprehensive (loss) income, net of tax	1.8
Balance, ending	(62.8)
Foreign Currency Translation [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(55.0)
Other comprehensive income (loss) before reclassifications	(56.3)
Amounts reclassified out	0
Other comprehensive (loss) income, net of tax	(56.3)
Balance, ending	$ (111.3)