Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized income tax benefits that would affect effective tax rate	$ 144.2	$ 139.9
Accrued or deferred taxes relating to uncertain income tax positions	46.1	47.0
Accrued interest and penalties relating to unrecognized tax benefits	$ 17.6	$ 16.4