Income Taxes - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Income Tax Contingency [Line Items]
Net tax provision		$ 142.1	$ 76.6	$ 307.5
Income taxes payments, net		102.0	94.7	155.0
Tax Cuts and Jobs Act, tax expense				1.6
Tax Cuts and Jobs Act, transition tax				$ 222.0	$ 290.0
Increase in effective tax rate after Transition Tax, percent				0.485
Deferred income tax benefit related to Reinvent SSE strategy	$ 49.0	(80.8)	54.4	$ (9.7)
Foreign net operating losses		195.1
State tax credits		6.0
Decrease in valuation allowance		(9.5)
Deferred tax liability, unremitted foreign earnings	10.0	11.0	10.0
Unremitted foreign earnings		5,200.0
Decrease in unrecognized tax benefits		(10.7)
Increase in unrecognized tax benefit during the year			33.9
Decrease in income tax provision if unrecognized tax benefits were recognized		333.0
Tax penalties	13.1	5.6	13.1
Interest and penalties	56.2	65.3	56.2	18.2
Unrecognized tax benefits	$ 390.3	379.6	$ 390.3	$ 356.4	$ 214.3
Settlement agreement (as defined therein) and tax deduction		1,490.0
U.S federal tax liability, decrease		525.0
Minimum
Income Tax Contingency [Line Items]
Reduction in unrecognized tax benefit in the next 12 months		$ 0.9
Period subject to examination for income tax return		3 years
Statute of limitation period for income tax return in foreign jurisdictions		3 years
Maximum
Income Tax Contingency [Line Items]
Reduction in unrecognized tax benefit in the next 12 months		$ 2.3
Period subject to examination for income tax return		5 years
Statute of limitation period for income tax return in foreign jurisdictions		5 years
Federal
Income Tax Contingency [Line Items]
Tax credit carryforwards amount		$ 0.4
Foreign Country
Income Tax Contingency [Line Items]
Foreign net operating loss carryforwards		930.6
State And Local Jurisdiction
Income Tax Contingency [Line Items]
State net operating loss carry forwards		506.3
Tax credit carryforwards amount		$ 7.8
State And Local Jurisdiction | Over One
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years		1 year
State And Local Jurisdiction | 19
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years		19 years