Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized income tax benefits that would affect effective tax rate		$ 248.0	$ 210.7
Unrecognized tax benefits		55.0	44.9
Accrued or deferred taxes relating to uncertain income tax positions		99.0	51.0
Accrued interest and penalties relating to unrecognized tax benefits		$ 37.5	$ 28.4
Other Noncash Income Tax Expense	$ 53.7