Equity - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 29, 2018
RSUs
Restricted Stock Units
Outstanding at the beginning of the period (in shares)			5,820,560
Granted (in shares)			4,682,672
Vested (in shares)			(504,320)
Forfeited (in shares)			(98,533)
Outstanding at the end of the period (in shares)	9,900,379		9,900,379
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 4.06
Granted (in dollars per share)			3.26
Vested (in dollars per share)			3.02
Forfeited (in dollars per share)			2.48
Outstanding at the end of the period (in dollars per share)	$ 3.75		$ 3.75
Unrecognized compensation cost
Stock based compensation expense recognized	$ 2.4	$ 0.6	$ 7.2	$ 2.1
Total unrecognized compensation	$ 29.4		$ 29.4
Weighted-average period for recognition of unrecognized compensation cost			2 years 2 months 12 days
PSUs
Restricted Stock Units
Granted (in shares)	1,593,500
Forfeited (in shares)	0
Outstanding at the end of the period (in shares)	2,943,500		2,943,500
Unrecognized compensation cost
Stock based compensation expense recognized	$ 0.5	$ 0.0	$ 1.3	$ 0.0
Management Incentive Plan
Management Incentive Plan
Number of shares of common stock authorized for issuance					1,776,500