Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Net operating loss carry forwards	$ 21.5	$ 19.3
Accrued expenses	18.8	30.7
Accrued compensation	8.1	12.8
Book over tax cost unfavorable acquired lease contracts	8.2	16.1
Other	0.0	1.2
Total gross deferred tax assets	56.6	80.1
Less: valuation allowance	(7.1)	(6.6)
Total deferred tax assets	49.5	73.5
Deferred tax liabilities
Prepaid expenses	(0.1)	(0.4)
Undistributed foreign earnings	(0.3)	(0.9)
Tax over book depreciation and amortization	(3.8)	(6.4)
Tax over book goodwill amortization	(18.2)	(28.0)
Tax over book cost favorable acquired lease contracts	(6.1)	(11.9)
Equity investments in unconsolidated entities	(5.1)	(8.0)
Total deferred tax liabilities	(33.6)	(55.6)
Net deferred tax asset	$ 15.9	$ 17.9