Consolidated Statements of Changes in Shareholders Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest
Treasury Stock, Value	$ (2,456.7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	857.0
Balance, shares at Dec. 31, 2020		105,542,162
Balance at Dec. 31, 2020		$ 1.1	$ 1,139.8	$ (154.1)	$ 2,326.4	$ 0.5
Net loss	(540.8)
Dividends, Common Stock, Cash	(4.3)				(4.3)
Proceeds from Issuance of Common Stock	0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		59,538
Employee equity awards, value	25.8		25.8
Stock forfeitures, shares		(523,551)
Net shares settled		116,025
Payment, Tax Withholding, Share-based Payment Arrangement	5.2		5.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans		66,523
Stock Issued During Period, Value, Employee Stock Purchase Plan	2.9		2.9
Stock Forfeitures, value	(17.1)		(17.1)
SERP shares issued		9,198
Other Comprehensive Income	130.4
Balance, shares at Dec. 31, 2021		105,037,845
Balance at Dec. 31, 2021		$ 1.1	1,146.2	(23.7)	1,781.4	0.5
Other retained earnings	0.1				0.1
Treasury Stock, Value	(2,456.7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	448.8
Net loss	(545.7)
Dividends, Common Stock, Cash	(3.2)				(3.2)
Proceeds from Issuance of Common Stock	0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		338,243
Employee equity awards, value	36.6		36.6
Stock forfeitures, shares		(95,262)
Net shares settled		163,126
Payment, Tax Withholding, Share-based Payment Arrangement	7.2		7.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans		134,721
Stock Forfeitures, value	0.0		0.0
Supplemental Retirement Plan Shares Issued Value	3.9		3.9
Other Comprehensive Income	(180.2)
Balance, shares at Dec. 31, 2022		105,252,421
Balance at Dec. 31, 2022	(247.5)	$ 1.1	1,179.5	(203.9)	1,232.5	3.7
Other retained earnings	3.2				0.0	3.2
Treasury Stock, Value	(2,456.7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(243.8)
Net loss	(616.2)
Proceeds from Issuance of Common Stock	220.7
Stock Issued During Period, Value, New Issues		$ 0.1	220.6
Stock Issued During Period, Shares, New Issues		10,454,545
Employee Benefits and Share-Based Compensation	2.5		2.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		416,956
Employee equity awards, value	26.8		26.8
Shares Issued, Value, Share-based Payment Arrangement, Forfeited	0.0
Stock forfeitures, shares		(231,022)
Net shares settled		199,809
Payment, Tax Withholding, Share-based Payment Arrangement	6.6		6.6
Stock Issued During Period, Shares, Employee Stock Purchase Plans		345,177
Stock Issued During Period, Value, Employee Stock Purchase Plan	6.3
Stock Forfeitures, value			0.0
SERP shares issued		16,023
Supplemental Retirement Plan Shares Issued Value			6.3
Other Comprehensive Income	114.3
Balance, shares at Dec. 31, 2023		116,054,291
Balance at Dec. 31, 2023	(499.7)	$ 1.2	$ 1,429.1	$ (89.6)	616.3	3.8
Other retained earnings	0.1				$ 0.0	$ 0.1
Treasury Stock, Value	(2,456.7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (495.9)