Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of accumulated other comprehensive loss
Currency translation adjustments, Beginning Balance	$ (17.1)	$ (17.1)	$ (17.1)
Currency translation adjustments, Other comprehensive income (loss)	0.6	0	0
Currency translation adjustments, Ending Balance	(16.5)	(17.1)	(17.1)
Unrealized loss on derivative financial instruments, Beginning Balance	(46.2)	(36.3)	(29.0)
Unrealized loss on derivative financial instruments, Other comprehensive income (loss)	11.4	0.1	(7.3)
Reclassification of purchase of additional interest in TRIP Holdings		(15.5)
Tax expense allocation related to TRIP Holdings unrealized loss on derivative financial instruments		5.5
Unrealized loss on derivative financial instruments, Ending Balance	(34.8)	(46.2)	(36.3)
Net actuarial gains/(losses) of defined benefit plans, Beginning Balance	(70.7)	(42.1)	(50.8)
Net actuarial gains/(losses) of defined benefit plans, Other comprehensive income (loss)	(28.1)	(28.6)	8.7
Net actuarial gains/(losses) of defined benefit plans, Ending Balance	(98.8)	(70.7)	(42.1)
Other, Beginning Balance	0	0	(1.1)
Other, net of tax benefit of $-, $-, and $0.7	0	0	1.1
Other, Ending Balance	0	0	0
Accumulated Other Comprehensive Loss, Beginning Balance	(134.0)	(95.5)	(98.0)
Other comprehensive income (loss)	(16.1)	(28.5)	2.5
Accumulated Other Comprehensive Loss, Ending Balance	$ (150.1)	$ (134.0)	$ (95.5)