Condensed Consolidated Statement of Changes in Stockholder's Equity - USD ($) $ in Millions	Common Stock	Treasury Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss), net	Total
Beginning balance at Dec. 31, 2020	$ 1.2	$ (1,250.4)	$ 2,713.3	$ 1,809.8	$ 75.0	$ 3,348.9
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(45.3)		(45.3)
Stock-based compensation	0.1		11.7			11.8
Repurchases of common stock from employee stock plans		(5.7)				(5.7)
Purchase of common stock		(47.6)				(47.6)
Shares issued under employee stock purchase plan			0.1			0.1
Net income (loss)				137.2		137.2
Other comprehensive income (loss)					4.8	4.8
Ending balance at Mar. 31, 2021	1.3	(1,303.7)	2,725.1	1,901.7	79.8	3,404.2
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(45.0)		(45.0)
Stock-based compensation			5.5			5.5
Repurchases of common stock from employee stock plans		(0.1)				(0.1)
Purchase of common stock		(33.7)				(33.7)
Shares issued under employee stock purchase plan			0.1			0.1
Net income (loss)				105.5		105.5
Other comprehensive income (loss)					6.0	6.0
Ending balance at Jun. 30, 2021	1.3	(1,337.5)	2,730.7	1,962.2	85.8	3,442.5
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(51.5)		(51.5)
Stock-based compensation			5.5			5.5
Repurchases of common stock from employee stock plans		(0.2)				(0.2)
Shares issued under employee stock purchase plan			0.1			0.1
Net income (loss)				120.4		120.4
Other comprehensive income (loss)					(19.8)	(19.8)
Ending balance at Sep. 30, 2021	1.3	(1,337.7)	2,736.3	2,031.1	66.0	3,497.0
Beginning balance at Dec. 31, 2021	1.1	(106.8)	1,509.4	2,145.5	55.6	3,604.8
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(51.4)		(51.4)
Stock-based compensation			9.1			9.1
Repurchases of common stock from employee stock plans		(8.4)				(8.4)
Purchase of common stock		(70.0)				(70.0)
Shares issued under employee stock purchase plan			0.1			0.1
Net income (loss)				109.6		109.6
Other comprehensive income (loss)					(26.5)	(26.5)
Ending balance at Mar. 31, 2022	1.1	(185.2)	1,518.6	2,203.7	29.1	3,567.3
Beginning balance at Dec. 31, 2021	1.1	(106.8)	1,509.4	2,145.5	55.6	3,604.8
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss)					(159.4)
Ending balance at Sep. 30, 2022	1.1	(201.2)	1,532.9	2,064.8	(103.8)	3,293.8
Beginning balance at Mar. 31, 2022	1.1	(185.2)	1,518.6	2,203.7	29.1	3,567.3
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(51.2)		(51.2)
Stock-based compensation			7.0			7.0
Repurchases of common stock from employee stock plans		(0.2)				(0.2)
Purchase of common stock		(15.6)				(15.6)
Shares issued under employee stock purchase plan			0.1			0.1
Net income (loss)				(184.5)		(184.5)
Other comprehensive income (loss)					(61.0)	(61.0)
Ending balance at Jun. 30, 2022	1.1	(201.0)	1,525.7	1,968.0	(31.9)	3,261.9
Increase (Decrease) in Stockholders' Equity
Cash dividends on common stock				(53.4)		(53.4)
Stock-based compensation			7.0			7.0
Repurchases of common stock from employee stock plans		(0.2)				(0.2)
Shares issued under employee stock purchase plan			0.2			0.2
Net income (loss)				150.2		150.2
Other comprehensive income (loss)					(71.9)	(71.9)
Ending balance at Sep. 30, 2022	$ 1.1	$ (201.2)	$ 1,532.9	$ 2,064.8	$ (103.8)	$ 3,293.8