Mezzanine and Shareholders' Equity - Summary of Warrants (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Warrants outstanding (in shares)	3,331,995	3,648,541	0
Warrants assumed in the Merger (in shares)			1,898,541
Warrants granted (in shares)	0	0	1,750,000
Warrants exercised (in shares)	(177,405)	(286,357)
Warrants forfeited (in shares)	0	(30,189)
Warrants outstanding (in shares)	3,154,590	3,331,995	3,648,541	0
Weighted Average Exercise Price
Warrants outstanding (in dollars per share)	$ 9.93	$ 9.75	$ 0.00
Warrants assumed in the Merger (in dollars per share)			9.06
Warrants granted (in dollars per share)	0.00	0.00	10.49
Warrants exercised (in dollars per share)	9.32	7.84
Warrants forfeited (in dollars per share)	0.00	4.50
Warrants outstanding (in dollars per share)	$ 9.96	$ 9.93	$ 9.75	$ 0.00
Weighted Average Remaining Contractual Term (Years)
Warrants assumed in the Merger (term)			2 years 8 months 9 days
Warrants granted (term)			5 years
Warrants outstanding balance (term)	2 years 4 days	2 years 11 months 19 days	3 years 8 months 26 days	0 years
Aggregate Intrinsic Value
Warrants outstanding	$ 26.7	$ 33.1	$ 52.0	$ 0.0
Warrants assumed in the Merger			$ 1.8
Warrants exercised	$ 1.6	$ 3.0