CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Capital Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2023		$ 18.6	$ 151.8	$ 1,155.0	$ (66.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes		0.1	(1.3)
Shares issued for employee stock purchase plan			0.9
Equity compensation expense			8.8
Shares repurchased		(0.1)	(7.8)
Net income (loss)	$ 15.9			15.9
Other comprehensive income (loss)	(14.7)				(14.7)
Balance, end of period at Jun. 30, 2024	1,260.8	18.6	152.4	1,170.9	(81.1)
Balance, beginning of period at Mar. 31, 2024		18.7	153.8	1,162.8	(75.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes			(0.1)
Shares issued for employee stock purchase plan			0.9
Equity compensation expense			5.3
Shares repurchased		(0.1)	(7.5)
Net income (loss)	8.1			8.1
Other comprehensive income (loss)	(5.6)				(5.6)
Balance, end of period at Jun. 30, 2024	1,260.8	18.6	152.4	1,170.9	(81.1)
Balance, beginning of period at Dec. 31, 2024	1,251.6	18.5	147.3	1,181.1	(95.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes			(1.4)
Shares issued for employee stock purchase plan			0.7
Equity compensation expense			7.9
Shares repurchased		(0.4)	(27.7)
Excise tax on repurchased shares			(0.4)
Net income (loss)	(75.0)			(75.0)
Other comprehensive income (loss)	51.4				51.4
Balance, end of period at Jun. 30, 2025	1,206.7	18.1	126.4	1,106.1	(43.9)
Balance, beginning of period at Mar. 31, 2025		18.5	149.7	1,179.7	(77.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes			(0.2)
Shares issued for employee stock purchase plan			0.7
Equity compensation expense			4.3
Shares repurchased		(0.4)	(27.7)
Excise tax on repurchased shares			(0.4)
Net income (loss)	(73.6)			(73.6)
Other comprehensive income (loss)	33.7				33.7
Balance, end of period at Jun. 30, 2025	$ 1,206.7	$ 18.1	$ 126.4	$ 1,106.1	$ (43.9)