Consolidated Statement of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, Common
Balance (in shares) at Dec. 31, 2021		43,136,273
Balance at Dec. 31, 2021	$ 1,415.9	$ 0.0	$ 689.0	$ 1,526.5	$ (35.3)	$ (764.3)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	70.5			70.5
Other Comprehensive Income (loss)
Unrealized gain (loss) on available-for-sale investments, net of income tax	(7.0)				(7.0)
Reclassification of adjustments for gains (losses) included in net income, net of income tax	1.5				1.5
Foreign currency translation adjustment	(58.2)				(58.2)
Other comprehensive income (loss), net	(63.7)				(63.7)
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net	(30.0)		(33.6)	0.0	0.0	3.6
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)		226,652
Reclassification of awards previously liability-classified that were converted to equity	19.2		19.2	0.0	0.0	0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Stock-based compensation — restricted stock units	35.9		35.9	0.0	0.0	0.0
Stock-based compensation — market stock units	10.1		10.1
Stock-based compensation — performance stock units	37.2		37.2
Common share repurchased (in shares)		(882,874)
Common share repurchased	$ (226.0)		0.0	0.0	0.0	(226.0)
Dividends declared per common share (in dollars per share)	$ 1.46
Dividends declared	$ (62.0)		0.0	(62.0)	0.0	0.0
Balance (in shares) at Dec. 31, 2022		42,480,051
Balance at Dec. 31, 2022	1,207.1	$ 0.0	757.8	1,535.0	(99.0)	(986.7)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	141.1			141.1	0.0
Other Comprehensive Income (loss)
Unrealized gain (loss) on available-for-sale investments, net of income tax	2.1			0.0	2.1
Reclassification of adjustments for gains (losses) included in net income, net of income tax	(2.2)			0.0	(2.2)
Foreign currency translation adjustment	12.6			0.0	12.6
Other comprehensive income (loss), net	12.5			0.0	12.5
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net	(30.3)		(32.9)			2.6
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)		256,615
Reclassification of awards previously liability-classified that were converted to equity	11.3		11.3
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Stock-based compensation — restricted stock units	38.8		38.8
Stock-based compensation — market stock units	7.5		7.5
Stock-based compensation — performance stock units	6.5		6.5
Common share repurchased (in shares)		(8,484)
Common share repurchased	$ (1.4)					(1.4)
Dividends declared per common share (in dollars per share)	$ 1.53
Dividends declared	$ (65.3)			(65.3)
Balance (in shares) at Dec. 31, 2023	42,728,182	42,728,182
Balance at Dec. 31, 2023	$ 1,327.8	$ 0.0	789.0	1,610.8	(86.5)	(985.5)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	369.9			369.9
Other Comprehensive Income (loss)
Unrealized gain (loss) on available-for-sale investments, net of income tax	2.8				2.8
Reclassification of adjustments for gains (losses) included in net income, net of income tax	(2.8)				(2.8)
Foreign currency translation adjustment	(32.9)				(32.9)
Other comprehensive income (loss), net	(32.9)				(32.9)
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net	(29.1)		(32.3)			3.2
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)		174,498
Reclassification of awards previously liability-classified that were converted to equity	11.3		11.3
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Stock-based compensation — restricted stock units	38.4		38.4
Stock-based compensation — market stock units	16.2		16.2
Stock-based compensation — performance stock units	0.1		0.1
Common share repurchased (in shares)		(33,300)
Common share repurchased	$ (11.6)					(11.6)
Dividends declared per common share (in dollars per share)	$ 1.67
Dividends declared	$ (71.5)			(71.5)
Balance (in shares) at Dec. 31, 2024	42,869,380	42,869,380
Balance at Dec. 31, 2024	$ 1,618.6	$ 0.0	$ 822.7	$ 1,909.2	$ (119.4)	$ (993.9)