Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	$ (75.9)
Other comprehensive (loss) income before reclassifications	34.5
Amounts reclassified from AOCI	9.0
Other comprehensive income (loss), net of tax	43.5	(4.4)	(40.2)
Balance, ending	(32.4)	(75.9)
Losses on Cash Flow Hedges [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(9.0)
Other comprehensive (loss) income before reclassifications	(1.8)
Amounts reclassified from AOCI	4.8
Other comprehensive income (loss), net of tax	3.0
Balance, ending	(6.0)
Unrealized Gains on Investment Securities [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	0.8
Other comprehensive (loss) income before reclassifications	3.5
Amounts reclassified from AOCI	0
Other comprehensive income (loss), net of tax	3.5
Balance, ending	4.3
Defined Benefit Pension and Other Postretirement Plans [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	(84.9)
Other comprehensive (loss) income before reclassifications	33.7
Amounts reclassified from AOCI	4.2
Other comprehensive income (loss), net of tax	37.9
Balance, ending	(47.0)
Foreign Currency Translation [Member]
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning	17.2
Other comprehensive (loss) income before reclassifications	(0.9)
Amounts reclassified from AOCI	0
Other comprehensive income (loss), net of tax	(0.9)
Balance, ending	$ 16.3