Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Components of accumulated other comprehensive loss
Currency translation adjustments, Beginning Balance	$ (17.1)
Currency translation adjustments, Ending Balance	(17.1)
Unrealized loss on derivative financial instruments, Beginning Balance	(46.2)
Unrealized loss on derivative financial instruments, other comprehensive income	2.4
Unrealized loss on derivative financial instruments, Ending Balance	(43.8)
Funded status of pension liability, Beginning Balance	(70.7)
Funded status of pension liability, other comprehensive income	0.6
Funded status of pension liability, Ending Balance	(70.1)
Accumulated Other Comprehensive Loss, Beginning Balance	(134.0)
Other comprehensive income, net of tax	3.0
Accumulated Other Comprehensive Loss, Ending Balance	(131.0)
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Currency translation adjustments, Net of tax benefit	0.2
Unrealized loss on derivative financial instruments, Net of tax benefit	33.1
Funded status of pension liability, other comprehensive income	41.4
Accumulated Other Comprehensive Loss, Net of tax benefit	$ 74.7