Related Party Transactions - Schedule of Other Related Party Balances (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Accounts receivable	$ 13.3	$ 10.1
Prepaid expenses	3.6	2.7
Accounts payable	5.7	5.2
Deferred revenue	14.2	7.9
Accrued liabilities	6.2	5.1
Debt payable – related party	685.3	686.0
Lease liability – related party	24.7	24.9
Accrued interest, related parties	2.9	2.6
Fuel accrual, related parties	1.4	1.6
Other accrued liabilities, related parties	1.9	0.9
Unamortized debt issuance costs	1.6	0.9
Affiliated Entity
Related Party Transaction [Line Items]
Unamortized debt issuance costs	$ 1.6	$ 0.9