CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) $ in Millions	Common Stock	Management Units	Treasury Stock at Cost	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balances at beginning of period at Dec. 31, 2016	$ 0.7			$ (58.8)		$ (617.9)	$ (676.0)
Balances at beginning of period (in shares) at Dec. 31, 2016	66,498,762	201,696
Increase (Decrease) in Stockholders' Deficit
Repurchase of old management units				(8.8)			(8.8)
Cancellation of management D units (in units)		(201,696)
Proceeds from issuance of common stock, net of issue costs	$ 0.2			333.9			334.1
Proceeds from issuance of common stock, net of issue costs (in shares)	20,970,589
Contribution from Parent				20.3			20.3
Non-cash compensation expense				13.4			13.4
Issuance of restricted stock, net (in shares)	1,418,564
Purchase of shares			$ (4.8)				$ (4.8)
Purchase of shares (in shares)	(461,173)						(461,173)
Other				(0.1)			$ (0.1)
Net income (loss)						185.3	185.3
Balances at end of period at Dec. 31, 2017	$ 0.9		(4.8)	299.9		(432.6)	(136.6)
Balances at end of period (in shares) at Dec. 31, 2017	88,426,742
Increase (Decrease) in Stockholders' Deficit
Impact of change in accounting policy						9.1	9.1
Changes in accumulated other comprehensive loss, net					$ (6.5)		(6.5)
Stock-based compensation				13.0			13.0
Issuance of restricted stock, net (in shares)	1,684,778
Purchase of shares			(73.3)				$ (73.3)
Purchase of shares (in shares)	(7,431,140)						(7,431,140)
Other				(0.2)			$ (0.2)
Net income (loss)						(87.3)	(87.3)
Balances at end of period at Dec. 31, 2018	$ 0.9		(78.1)	312.7	(6.5)	(510.8)	$ (281.8)
Balances at end of period (in shares) at Dec. 31, 2018	82,680,380						82,680,380
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive loss, net					(9.0)		$ (9.0)
Stock-based compensation				10.1			10.1
Issuance of restricted stock, net (in shares)	1,609,514
Purchase of shares			(1.6)				$ (1.6)
Purchase of shares (in shares)	(186,786)						(186,786)
Net income (loss)						36.4	$ 36.4
Balances at end of period at Dec. 31, 2019	$ 0.9		$ (79.7)	$ 322.8	$ (15.5)	$ (474.4)	$ (245.9)
Balances at end of period (in shares) at Dec. 31, 2019	84,103,108						84,103,108