Reconciliation of Effective Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Valuation Allowance [Line Items]
U.S. federal statutory income tax rate										35.00%		35.00%		35.00%
Income tax provision at U.S. federal statutory rate										$ 236.2		$ 258.4		$ 157.7
State and local income taxes, net of federal income tax benefit										27.3		15.3		10.8
Impact of foreign operations, including withholding taxes										8.4		(21.9)		4.7
Change in net valuation allowance										(57.3)	[1]	(32.9)	[1]	(2.4)	[1]
Worthless securities deduction										0		(23.0)		(2.5)
Increases (decreases) in unrecognized tax benefits, net										24.1		(2.7)		8.9
Other										(25.4)		(3.0)		(5.9)
Total provision for income taxes	140.5	41.9	50.1	(19.2)	93.7	70.4	47.6	(21.5)		213.3		190.2		171.3
Effective income tax rate on operations										31.60%		25.80%		38.00%
Tax contingency reserve adjustment									19.5
Asia Pacific
Valuation Allowance [Line Items]
Reversal of valuation allowance										(26.2)
Continental Europe
Valuation Allowance [Line Items]
Reversal of valuation allowance										$ (21.8)

[1] Reflects changes in valuation allowance that impacted the effective income tax rate for each year presented.