Income Taxes - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Contingency [Line Items]
Net tax provision			$ 76.6	$ 307.5	$ 330.5
Income taxes payments, net			94.7	155.0	161.7
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change In tax rate, deferred tax asset, provisional income tax expense				1.6	41.1
Tax Cuts And Jobs Act Of 2017, incomplete accounting, Transition Tax, for accumulated foreign earnings, provisional income tax expense		$ 290.0		$ 222.0
Increase in effective tax rate after Transition Tax, percent				0.485
Deferred income tax benefit related to Reinvent SSE strategy	$ 49.0		54.4	$ (9.7)	(130.6)
Foreign net operating losses	183.4		183.4
State tax credits	7.7		7.7
Decrease in valuation allowance			20.8
Deferred tax liability, unremitted foreign earnings	10.0		10.0	0.0
Unremitted foreign earnings	4,700.0		4,700.0
Increase in unrecognized tax benefit during the year			33.9	142.1
Decrease in income tax provision if unrecognized tax benefits were recognized	343.5		343.5
Tax penalties	13.1		13.1		4.0
Interest and penalties	56.2		56.2	18.2	14.8
Unrecognized tax benefits	390.3		390.3	$ 356.4	$ 214.3	$ 162.6
Settlement agreement (as defined therein) and tax deduction	1,490.0		1,490.0
Minimum
Income Tax Contingency [Line Items]
Reduction in unrecognized tax benefit in the next 12 months	4.6		$ 4.6
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	6.6		$ 6.6
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	0.6		$ 0.6
Foreign Country
Income Tax Contingency [Line Items]
Foreign net operating loss carryforwards	899.4		899.4
State And Local Jurisdiction
Income Tax Contingency [Line Items]
State net operating loss carry forwards	569.3		569.3
Tax credit carryforwards amount	$ 9.8		$ 9.8
State And Local Jurisdiction | Minimum
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years			1 year
State And Local Jurisdiction | Maximum
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years			20 years
State And Local Jurisdiction | Over One
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years			1 year
State And Local Jurisdiction | 20
Income Tax Contingency [Line Items]
Operating loss carryforwards, expirations, years			19 years