Reconciliation of Effective Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
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									$ 163.8		$ 236.2		$ 258.4
State and local income taxes, net of federal income tax benefit									6.5		27.3		15.3
Impact of foreign operations, including withholding taxes									30.5		8.4		(21.9)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent									3.2	[1]	(57.3)	[1]	(32.9)	[1]
Worthless securities deduction									(22.2)		0		(23.0)
Increases (decreases) in unrecognized tax benefits, net									0		24.1		(2.7)
Other									(0.6)		(25.4)		(3.0)
Total provision for income taxes	$ 103.2	$ 28.4	$ 62.0	$ (12.4)	$ 140.5	$ 41.9	$ 50.1	$ (19.2)	$ 181.2		$ 213.3		$ 190.2
Effective income tax rate on operations									38.70%		31.60%		25.80%

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