Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Balance at beginning of period	$ 345.3	$ 335.4	$ 271.9
Increases as a result of tax positions taken during a prior year	18.1	22.7	65.9
Decreases as a result of tax positions taken during a prior year	(165.7)	(25.8)	(10.8)
Settlements with taxing authorities	(6.2)	(8.1)	(6.5)
Lapse of statutes of limitation	(0.7)	(0.6)	(1.7)
Increases as a result of tax positions taken during the current year	26.8	21.7	16.6
Balance at end of period	217.6	345.3	$ 335.4
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	188.9
Income tax penalties and interest accrued	33.4	39.6
Income tax penalties and interest expense	6.2	(2.8)
Deferred Tax and Other Liabilities, Noncurrent	740.3	$ 761.2
Minimum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefits	20.0
Maximum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefits	$ 30.0