Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions		Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Beginning Balance at Dec. 31, 2018		$ 1,873.2	$ 0.1	$ 793.9	$ 1,084.8	$ (5.6)
Beginning Balance, Shares at Dec. 31, 2018			54.0
Net issuance under stock-based plans		(11.0)		(11.0)
Net issuance under stock-based plans, shares			0.6
Settlement of share-based compensation awards	[1]	30.6		30.6
Stock-based compensation		50.3		50.3
Cash dividend		(43.5)			(43.5)
Stock dividends accrued				0.5	(0.5)
Comprehensive income (net of tax):
Net income		140.4			140.4
Other comprehensive income (loss)		(16.7)				(16.7)
Ending Balance at Dec. 31, 2019		2,023.3	$ 0.1	864.3	1,181.2	(22.3)
Ending Balance, Shares at Dec. 31, 2019			54.6
Net issuance under stock-based plans		(20.7)		(20.7)
Net issuance under stock-based plans, shares			0.6
Stock-based compensation		29.6		29.6
Cash dividend		(44.0)			(44.0)
Comprehensive income (net of tax):
Net income		350.1			350.1
Other comprehensive income (loss)		22.6				22.6
Ending Balance at Dec. 31, 2020		2,360.9	$ 0.1	873.2	1,487.3	0.3
Ending Balance, Shares at Dec. 31, 2020			55.2
Net issuance under stock-based plans		(3.3)		(3.3)
Net issuance under stock-based plans, shares			0.3
Stock-based compensation		36.7		36.7
Cash dividend		(47.6)			(47.6)
Stock dividends accrued				0.1	(0.1)
Comprehensive income (net of tax):
Net income		551.4			551.4
Other comprehensive income (loss)		(11.5)				(11.5)
Ending Balance at Dec. 31, 2021		$ 2,886.6	$ 0.1	$ 906.7	$ 1,991.0	$ (11.2)
Ending Balance, Shares at Dec. 31, 2021			55.5

[1] Represents the vested but unissued portion of Electro Scientific Industries, Inc. (“ESI”) share-based compensation awards as of the acquisition date of February 1, 2019 as described further in Note 5.