CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Preferred stock	Common stock	Additional paid-in capital	Treasury stock, at cost	Accumulated other comprehensive loss	Accumulated deficit
Balance, start at Dec. 31, 2019	$ 675.0	$ 0.0	$ 1.0	$ 2,526.5	$ (86.3)	$ (109.8)	$ (1,656.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(123.3)						(123.3)
Other comprehensive income (loss)	(8.9)					(8.9)
Share-based compensation	3.5			3.5
Balance, end at Dec. 31, 2020	546.1	0.0	1.0	2,530.0	(86.3)	(118.8)	(1,779.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(167.1)						(167.1)
Other comprehensive income (loss)	36.5					36.5
Share-based compensation	10.1			10.1
Capped call premiums	(4.6)			(4.6)
Balance, end at Dec. 31, 2021	421.0	0.0	1.0	2,535.5	(86.3)	(82.3)	(1,946.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14.1)						(14.1)
Other comprehensive income (loss)	(11.7)					(11.7)
Share-based compensation	4.1			4.1
Balance, end at Dec. 31, 2022	$ 399.3	$ 0.0	$ 1.0	$ 2,539.6	$ (86.3)	$ (94.0)	$ (1,961.0)