Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2009
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate		20.80%	37.40%	26.30%	28.40%
Federal statutory rate			35.00%	35.00%
Cost-sharing adjustment, discrete amount		$ 13.2	$ 0.0	$ 13.2	$ 0.0
Tax on equity investments		0.0	0.7	0.0	36.3
Restructuring		0.0	9.2	0.0	(46.7)
Tax on gain on litigation settlement		0.0	$ 0.0	0.0	44.7
Cost-sharing adjustment	$ 70.3			18.0
Valuation allowance release related to gain on sale of equity investments					$ 24.7
Unrecognized tax benefits		211.4		211.4
Unrecognized tax benefits that would impact effective tax rate		176.7		176.7
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		$ 4.7		$ 4.7