Equity - Rollforward of Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)		36,350,425			36,350,425
Beginning balance	$ 234.6	$ 195.2	$ 568.2	$ 631.4	$ 195.2	$ 631.4
Net income (loss)	(146.5)	20.5	(283.7)	(56.0)	(126.0)	(339.7)
Other comprehensive income (loss)	28.2	17.4	(1.9)	(8.9)	$ 45.6	(10.8)
Tax payments related to vested restricted stock units		(2.6)	(0.2)	(2.6)
Share-based compensation plans	$ 4.4	4.1	2.4	4.3
Ending balance (shares)	36,465,192				36,465,192
Ending balance	$ 120.7	$ 234.6	$ 284.8	$ 568.2	$ 120.7	$ 284.8
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)	43,785,000	43,630,000	43,585,000	43,447,000	43,630,000	43,447,000
Beginning balance	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4
Common stock issued (shares)	15,000	155,000	20,000	138,000
Ending balance (shares)	43,800,000	43,785,000	43,605,000	43,585,000	43,800,000	43,605,000
Ending balance	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4
Additional paid in capital
Increase (Decrease) in Stockholders' Equity
Beginning balance	180.9	176.8	169.2	164.9	176.8	164.9
Share-based compensation plans	4.4	4.1	2.4	4.3
Ending balance	185.3	180.9	171.6	169.2	185.3	171.6
Retained earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance	592.5	572.0	946.3	1,002.3	572.0	1,002.3
Net income (loss)	(146.5)	20.5	(283.7)	(56.0)
Ending balance	446.0	592.5	662.6	946.3	446.0	662.6
Accumulated other comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	(24.0)	(41.4)	(35.6)	(26.7)	(41.4)	(26.7)
Other comprehensive income (loss)	28.2	17.4	(1.9)	(8.9)
Ending balance	4.2	(24.0)	(37.5)	(35.6)	4.2	(37.5)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Beginning balance	(515.2)	(512.6)	(512.1)	(509.5)	(512.6)	(509.5)
Tax payments related to vested restricted stock units		(2.6)	(0.2)	(2.6)
Share-based compensation plans			0.0
Ending balance	$ (515.2)	$ (515.2)	$ (512.3)	$ (512.1)	$ (515.2)	$ (512.3)