Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2020		65.4
Beginning balance at Dec. 31, 2020	$ 4,563.4	$ 6.5	$ 1,805.2	$ 2,071.2	$ 680.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(14.7)			(14.7)
Other Comprehensive Income (Loss), Net of Tax	$ (201.1)				(201.1)
Dividends paid to shareholders per share (in dollars per share)	$ 0.93
Cash Dividends and Dividend Equivalents to Shareholders	$ (61.1)			(61.1)
Repurchases of Common Stock (in shares)		2.1
Repurchases of Common Stock (Note 12)	(161.7)	$ (0.2)	(57.8)	(103.7)
Shares Issued Under Employee Stock Purchase Plan (Note 12)		$ 0.1	3.9
Shares Issued Under Employee Stock Purchase Plan (Note 12)	3.9
Equity-based Compensation Cost	24.6		24.6
Equity-based Awards, Net of Shares Exchanged (in shares)		0.3
Equity-based Awards, Net of Shares Exchanged	(2.1)	$ 0.1	1.1	(3.3)
Ending balance (in shares) at Sep. 30, 2021		63.7
Ending balance at Sep. 30, 2021	4,151.2	$ 6.4	1,777.0	1,888.4	479.4
Beginning balance (in shares) at Jun. 30, 2021		63.6
Beginning balance at Jun. 30, 2021	4,306.2	$ 6.4	1,770.9	1,985.9	543.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(75.3)			(75.3)
Other Comprehensive Income (Loss), Net of Tax	$ (63.6)				(63.6)
Dividends paid to shareholders per share (in dollars per share)	$ 0.31
Cash Dividends and Dividend Equivalents to Shareholders	$ (19.7)			(19.7)
Repurchases of Common Stock (in shares)		0.1
Repurchases of Common Stock (Note 12)	(3.0)	$ 0.0	(1.1)	(1.9)
Shares Issued Under Employee Stock Purchase Plan (Note 12)		$ 0.1	1.4
Shares Issued Under Employee Stock Purchase Plan (Note 12)	1.4
Equity-based Compensation Cost	6.1		6.1
Equity-based Awards, Net of Shares Exchanged (in shares)		0.1
Equity-based Awards, Net of Shares Exchanged	(0.9)	$ 0.0	(0.3)	(0.6)
Ending balance (in shares) at Sep. 30, 2021		63.7
Ending balance at Sep. 30, 2021	4,151.2	$ 6.4	1,777.0	1,888.4	479.4
Beginning balance (in shares) at Dec. 31, 2021		63.7
Beginning balance at Dec. 31, 2021	4,007.7	$ 6.4	1,790.7	1,762.5	448.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(245.7)			(245.7)
Other Comprehensive Income (Loss), Net of Tax	$ (1,294.7)				(1,294.7)
Dividends paid to shareholders per share (in dollars per share)	$ 0.93
Cash Dividends and Dividend Equivalents to Shareholders	$ (60.3)			(60.3)
Shares Issued Under Employee Stock Purchase Plan (Note 12)		$ 0.1	3.8
Shares Issued Under Employee Stock Purchase Plan (Note 12)	3.8
Equity-based Compensation Cost	28.5		28.5
Equity-based Awards, Net of Shares Exchanged (in shares)		0.1
Equity-based Awards, Net of Shares Exchanged	(1.7)	$ 0.0	(0.8)	(0.9)
Ending balance (in shares) at Sep. 30, 2022		63.9
Ending balance at Sep. 30, 2022	2,437.6	$ 6.4	1,822.2	1,455.6	(846.6)
Beginning balance (in shares) at Jun. 30, 2022		63.8
Beginning balance at Jun. 30, 2022	2,850.0	$ 6.4	1,812.5	1,551.9	(520.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(76.2)			(76.2)
Other Comprehensive Income (Loss), Net of Tax	$ (325.8)				(325.8)
Dividends paid to shareholders per share (in dollars per share)	$ 0.31
Cash Dividends and Dividend Equivalents to Shareholders	$ (20.1)			(20.1)
Shares Issued Under Employee Stock Purchase Plan (Note 12)		$ 0.1	1.3
Shares Issued Under Employee Stock Purchase Plan (Note 12)	1.3
Equity-based Compensation Cost	8.3		8.3
Equity-based Awards, Net of Shares Exchanged (in shares)		0.0
Equity-based Awards, Net of Shares Exchanged	0.1	$ 0.0	0.1	0.0
Ending balance (in shares) at Sep. 30, 2022		63.9
Ending balance at Sep. 30, 2022	$ 2,437.6	$ 6.4	$ 1,822.2	$ 1,455.6	$ (846.6)