Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized income tax benefits that would affect effective tax rate	$ 133.9	$ 130.6
Accrued or deferred taxes relating to uncertain income tax positions	62.2	64.7
Accrued interest and penalties relating to unrecognized tax benefits	$ 17.1	$ 15.3