Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2009
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate	30.10%	24.90%	30.40%	25.00%
Federal statutory rate		35.00%	35.00%
Tax on equity investments	$ 0.0	$ 0.0	$ 0.0	$ 35.6
Restructuring	0.2	(25.1)	(1.1)	(55.9)
Tax on gain on litigation settlement	0.0	$ 44.7	0.0	44.7
Valuation allowance release related to gain on sale of equity investments				$ 24.7
Unrecognized tax benefits	205.1		205.1
Unrecognized tax benefits that would impact effective tax rate	171.1		171.1
Foreign country
Income Tax Contingency [Line Items]
Interest and penalties recorded					$ 4.6
Maximum [Member]
Income Tax Contingency [Line Items]
Greater than remote likelihood decrease in gross unrecognized tax benefits within next 12 months	$ 3.1		$ 3.1