Income Taxes - Tax Effects of Temporary Differences Representing Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Loss reserves and accruals	$ 42.8	$ 41.8
Interest rate swaps	1.3	0.0
U.S. state net operating loss (“NOL”) carryforwards	38.2	17.9
Depreciation expense	0.0	0.4
Foreign NOL carryforwards	37.6	37.6
Operating lease liabilities	55.5
Other	1.5	0.1
Deferred tax assets	176.9	97.8
Valuation allowance on deferred tax assets	(69.7)	(52.3)
Net deferred tax assets	107.2	45.6
Deferred tax liabilities:
Goodwill and intangible franchise rights	(135.1)	(123.7)
Depreciation expense	(68.0)	(50.2)
Interest rate swaps	0.0	(2.8)
Operating lease ROU assets	(45.4)
Other	0.0	(0.1)
Deferred tax liabilities	(248.5)	(176.7)
Net deferred tax liability	$ (141.3)	$ (131.1)