Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Balance at beginning of period	$ 335.4	$ 271.9	$ 246.7
Increases as a result of tax positions taken during a prior year	22.7	65.9	6.3
Decreases as a result of tax positions taken during a prior year	(25.8)	(10.8)	(8.1)
Settlements with taxing authorities	(8.1)	(6.5)	(0.8)
Lapse of statutes of limitation	(0.6)	(1.7)	(3.3)
Increases as a result of tax positions taken during the current year	21.7	16.6	31.1
Balance at end of period	345.3	335.4	$ 271.9
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	296.4
Income tax penalties and interest accrued	39.6	42.4
Income tax penalties and interest expense	(2.8)	$ 14.5
Minimum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefits	10.0
Maximum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefits	$ 20.0