Income Taxes - Income Tax Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 150.9	$ 150.9
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year		178.1	$ 264.5	$ 223.1
Current Year [Abstract]
Additions		5.9	4.3	64.6
Prior Years [Abstract]
Additions		0.8	12.7	1.8
Reductions in unrecognized tax benefits		(3.3)	(33.8)	(16.6)
Settlements		(22.5)	(2.6)	(4.0)
Lapses in statutes of limitations		(7.7)	(67.0)	(4.4)
Balance at end of year	151.3	151.3	178.1	264.5
Tax expense recognized for net interest and penalties in the Consolidated Statements of Operations		2.8	5.2	8.5
Previously unrecognized tax benefits, income tax examination	30.9	30.9
Income tax examination, interest and penalties	8.4
Other long-term liabilities
Prior Years [Abstract]
Interest and penalties accrued related to unrecognized tax benefits	$ 29.9	29.9	$ 33.8	$ 40.7
Minimum | State and Local Jurisdiction | California Franchise Tax Board
Prior Years [Abstract]
Reductions in unrecognized tax benefits		(9.6)
Maximum | State and Local Jurisdiction | California Franchise Tax Board
Prior Years [Abstract]
Reductions in unrecognized tax benefits		$ (24.6)