Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1	$ (129.5)
Other comprehensive income before reclassifications	(172.6)
Amounts reclassified from accumulated other comprehensive income (loss)	1.7
Other Comprehensive Income	(170.9)
Balance March 31	(300.4)
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Income Before Income Taxes and Income From Equity Method Investments	330.8	333.3
Income Tax Expense	109.2	109.3
Net Income	224.8	226.0
Unrealized Gain and (Loss) on Available-for-Sale Securities
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1	(2.0)
Other comprehensive income before reclassifications	0.2
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other Comprehensive Income	0.2
Balance March 31	(1.8)
Defined Benefit Pension and Postemployment Plans
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1	(89.8)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income (loss)	1.7
Other Comprehensive Income	1.7
Balance March 31	(88.1)
Defined Benefit Pension and Postemployment Plans | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Prior service cost	1.4
Actuarial (gains) losses	1.6
Income Before Income Taxes and Income From Equity Method Investments	3.0
Income Tax Expense	1.3
Net Income	1.7
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1	(37.7)
Other comprehensive income before reclassifications	(172.8)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other Comprehensive Income	(172.8)
Balance March 31	$ (210.5)