Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions		3 Months Ended									12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	[2]	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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											$ 266.8	$ 252.3	$ 163.8
State and local income taxes, net of federal income tax benefit											18.3	21.4	6.5
Impact of foreign operations, including withholding taxes											16.1	1.7	30.5
Change in Net Valuation Allowance	[1]										(20.6)	(66.0)	3.2
Worthless securities deduction											0.0	0.0	(22.2)
Divestitures											11.9	0.0	0.0
Other											(9.7)	7.1	(0.6)
Total provision for income taxes		$ 145.4	$ 61.1	$ 77.7	$ (1.4)	$ 87.9		$ 65.0	$ 65.3	$ (1.7)	$ 282.8	$ 216.5	$ 181.2
Effective income tax rate on operations											37.10%	30.00%	38.70%

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

[2] The three months ended December 31, 2014 included a tax benefit of $67.6 due to the net reversal of valuation allowances on deferred tax assets in Continental Europe.