Condensed Consolidated Statement of Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock, Common	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2023		42,728,182
Balance at Dec. 31, 2023	$ 1,327.8	$ 0.0	$ (985.5)	$ 789.0	$ 1,610.8	$ (86.5)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	64.2				64.2
Other comprehensive income (loss):
Unrealized gain on available-for-sale investments, net of tax	1.9					1.9
Reclassification of realized gains on investments included in net income, net of tax	(1.9)					(1.9)
Foreign currency translation adjustment	(10.6)					(10.6)
Other comprehensive income (loss), net	(10.6)					(10.6)
Issuance of common stock related to vesting of stock units, net of shares withheld for taxes on settlements of stock units		17,388
Issuance of common stock related to vesting of stock units, net of shares withheld for taxes on settlements of stock units	(3.2)			(3.2)
Reclassification of awards previously liability-classified that were converted to equity	10.8			10.8
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Stock-based compensation	$ 11.4			11.4
Dividends declared (in dollars per share)	$ 0.41
Dividends declared	$ (17.3)				(17.3)
Balance (in shares) at Mar. 31, 2024		42,745,570
Balance at Mar. 31, 2024	$ 1,383.1	$ 0.0	(985.5)	808.0	1,657.7	(97.1)
Balance (in shares) at Dec. 31, 2024	42,869,380	42,869,380
Balance at Dec. 31, 2024	$ 1,618.6	$ 0.0	(993.9)	822.7	1,909.2	(119.4)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	78.5				78.5
Other comprehensive income (loss):
Unrealized gain on available-for-sale investments, net of tax	0.2					0.2
Reclassification of realized gains on investments included in net income, net of tax	(0.2)					(0.2)
Foreign currency translation adjustment	17.0					17.0
Other comprehensive income (loss), net	17.0					17.0
Issuance of common stock related to vesting of stock units, net of shares withheld for taxes on settlements of stock units		69
Issuance of common stock related to vesting of stock units, net of shares withheld for taxes on settlements of stock units	0.0			0.0
Reclassification of awards previously liability-classified that were converted to equity	16.0			16.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Stock-based compensation	9.1			9.1
Common share repurchased (in shares)		(368,199)
Common shares repurchased	$ (110.7)		(110.7)
Dividends declared (in dollars per share)	$ 0.46
Dividends declared	$ (19.3)				(19.3)
Balance (in shares) at Mar. 31, 2025	42,501,250	42,501,250
Balance at Mar. 31, 2025	$ 1,609.2	$ 0.0	$ (1,104.6)	$ 847.8	$ 1,968.4	$ (102.4)