Income Taxes - Schedule of Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Net operating loss carry forwards and tax credits	$ 23.5	$ 20.8
Lease liability	87.9	119.5
Accrued expenses	15.2	15.0
Accrued compensation	8.4	9.2
Depreciation	17.2
Other	3.4	1.4
Total gross deferred tax assets	155.6	165.9
Valuation allowances	(10.7)	(8.3)
Total deferred tax assets	144.9	157.6
Deferred tax liabilities
Prepaid expenses	(0.2)	(0.1)
Right of use asset	(62.8)	(114.9)
Undistributed foreign earnings	(0.2)	0.0
Depreciation and amortization		(0.7)
Goodwill amortization	(13.0)	(26.2)
Equity investments in unconsolidated entities	(4.9)	(5.1)
Total deferred tax liabilities	(81.1)	(147.0)
Net deferred tax asset	$ 63.8	$ 10.6