Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Foreign Currency Translation Gain (Loss) [Roll Forward]
Beginning Balance, Foreign Currency Translation Gain (Loss)	$ 14.4	$ 31.4
Change in Foreign Currency Translation Gain (Loss)	(2.5)	(17.0)
Foreign Currency Translation Gain (Loss), Income tax effect	0	0
Ending Balance, Foreign Currency Translation Gain (Loss)	11.9	14.4
Unrealized Gain (Loss) on Securities [Roll Forward]
Beginning Balance, Unrealized Gain (Loss) on Securities	(0.3)	(0.4)
Change in Unrealized Gain (Loss) on Securities	0.1	0.2
Unrealized Gain (Loss) on Securities, Reclassification adjustments into earnings	0	0
Unrealized Gain (Loss) on Securities, Income tax effect	0	(0.1)
Ending Balance, Unrealized Gain (Loss) on Securities	(0.2)	(0.3)
Unrealized Loss on Derivative Instruments [Roll Forward]
Beginning Balance, Unrealized Loss on Derivative Instruments	(43.0)	(44.5)
Change in Unrealized Loss on Derivative Instruments	4.3	0.6
Unrealized Loss on Derivative Instruments, Reclassification adjustments into earnings	1.6	1.6
Unrealized Loss on Derivative Instruments, Income tax effect	(1.5)	(0.7)
Ending Balance, Unrealized Loss on Derivative Instruments	(38.6)	(43.0)
Postretirement Benefit Plans [Roll Forward]
Beginning Balance, Post-Retirement Benefit Plans	(129.1)	(131.1)
Change in Post-Retirement Benefit Plans	0	0
Post-Retirement Benefit Plans, Reclassification adjustments into earnings	3.6	3.3
Post-Retirement Benefit Plans, Income tax effect	(1.3)	(1.3)
Ending Balance, Post-Retirement Benefit Plans	(126.8)	(129.1)
Other Comprehensive Income Change in Component	1.9	(16.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax	0	0
Reclassification adjustments into earnings, Total	5.2	4.9
Income tax effect, Total	(2.8)	(2.1)
Accumulated other comprehensive income (loss), net of tax	$ (153.7)	$ (158.0)	$ (144.6)