Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Other Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2018		76.8
Beginning balance at Dec. 31, 2018	$ 421.3	$ 7.7	$ 561.8	$ (12.7)	$ 103.9	$ (239.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	141.0				141.0
Other comprehensive income, net of income taxes	2.9					2.9
Repurchase of shares for option cost and to satisfy tax withholding obligations (in shares)		(0.3)
Repurchase of shares for option cost and to satisfy tax withholding obligations	(8.5)		(8.5)
Stock-based compensation and shares issued under equity plans, net (in shares)		0.8
Stock-based compensation and shares issued under equity plans, net	20.0		20.0
Ending balance (in shares) at Dec. 31, 2019		77.3
Ending balance at Dec. 31, 2019	576.7	$ 7.7	573.3	(12.7)	244.9	(236.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137.7				137.7
Other comprehensive income, net of income taxes	8.9					8.9
Repurchase of shares for option cost and to satisfy tax withholding obligations (in shares)		(0.3)
Repurchase of shares for option cost and to satisfy tax withholding obligations	(20.0)		(20.0)
Stock-based compensation and shares issued under equity plans, net (in shares)		1.1
Stock-based compensation and shares issued under equity plans, net	29.7		29.7
Purchase of treasury stock (in shares)		(1.3)
Purchase of treasury stock	(51.7)			(51.7)
Dividends	(447.8)				(447.8)
Ending balance (in shares) at Dec. 31, 2020		76.8
Ending balance at Dec. 31, 2020	233.5	$ 7.7	583.0	(64.4)	(65.2)	(227.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	143.7				143.7
Other comprehensive income, net of income taxes	126.6					126.6
Repurchase of shares for option cost and to satisfy tax withholding obligations (in shares)		(0.1)
Repurchase of shares for option cost and to satisfy tax withholding obligations	(5.8)		(5.8)
Stock-based compensation and shares issued under equity plans, net (in shares)		0.5
Stock-based compensation and shares issued under equity plans, net	$ 26.0		26.0
Purchase of treasury stock (in shares)	(1.3)
Purchase of treasury stock	$ (51.7)
Adjustment to dividends paid	13.4				13.4
Settlement of debt (in shares)		2.9
Settlement of debt	(3.9)	$ 0.3	(4.2)
Ending balance (in shares) at Dec. 31, 2021		80.1
Ending balance at Dec. 31, 2021	$ 533.5	$ 8.0	$ 599.0	$ (64.4)	$ 91.9	$ (101.0)