Related Party Transactions - Schedule of Other Related Party Balances (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Related Party Transactions [Abstract]
Accounts receivable	$ 23.8	$ 19.3	[1]
Prepaid expenses	11.9	3.3
Accounts payable	11.6	5.6	[1]
Deferred revenue	13.9	7.9	[1]
Accrued liabilities	7.2	5.1	[1]
Debt payable	1,844.0	686.0	[1]
Lease liability (4)	24.3	24.9	[1]
Accrued interest, related parties	6.6	2.6
Other accrued liabilities, related parties	0.6	0.9
Fuel accrual, related parties		1.6
Unamortized debt issuance costs	$ 2.9	$ 0.9

[1] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.