Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Components of accumulated other comprehensive loss
Currency translation adjustments, Beginning Balance	$ (17.1)
Currency translation adjustments, other comprehensive income	0.6
Currency translation adjustments, Ending Balance, net of tax benefit	(16.5)
Unrealized loss on derivative financial instruments, Beginning Balance	(46.2)
Unrealized loss on derivative financial instruments, other comprehensive income	3.9
Unrealized loss on derivative financial instruments, Ending Balance, net of tax benefit	(42.3)
Funded status of pension liability, Beginning Balance	(70.7)
Funded status of pension liability, other comprehensive income	1.1
Funded status of pension liability, Ending Balance, net of tax benefit	(69.6)
Accumulated Other Comprehensive Loss, Beginning Balance	(134.0)
Other comprehensive income, net of tax	5.6
Accumulated Other Comprehensive Loss, Ending Balance, net of tax benefit	(128.4)
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Currency translation adjustments, Tax benefit	0.2
Unrealized loss on derivative financial instruments, Tax benefit	(32.2)
Funded status of pension liability, Tax benefit	(41.0)
Accumulated Other Comprehensive Loss, Tax benefit	$ (73.0)