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Related Party Transactions (Details) $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 26, 2016	Aug. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Conversion ratio, preferred stock to common stock	1
Percentage retained under tax receivable agreement	15.00%
Estimated termination payment				$ 55.7		$ 55.7
Discount rate, tax receivable agreement liability				6.13%		6.13%
Affiliated Entity
Related Party Transaction [Line Items]
Rent expense				$ 1.1	$ 1.8	$ 5.0	$ 5.3
Affiliated Entity | Western Airways
Related Party Transaction [Line Items]
Net charter expense					$ 0.4		$ 1.0
Proceeds from sale of aircraft		$ 4.9	$ 1.3
Gain on sale of asset			$ 1.3
Affiliated Entity | Mosing Holdings
Related Party Transaction [Line Items]
Percentage of tax benefits realized payable	85.00%
Cumulative deficit, period						36 months
Tax receivable agreement, estimated liability				$ 7.4		$ 7.4

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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