Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized income tax benefits that would affect effective tax rate	$ 176.8	$ 166.1
Accrued or deferred taxes relating to uncertain income tax positions	57.6	58.5
Accrued interest and penalties relating to unrecognized tax benefits	$ 30.5	$ 27.2