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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 1,997.0
Net income	369.8	$ 866.8	$ 181.8
Share-based compensation cost	(27.7)	(27.3)	(17.4)
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(10.9)	(10.8)	(23.8)
Net other comprehensive income (loss)	9.0	10.5	$ 23.8
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(29.9)	(5.4)
Treasury Stock, Value, Acquired, Cost Method	125.0	200.0
BALANCE	$ 2,244.3	$ 1,997.0
Non-U.S. Subsidiary
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Subsidiary, Ownership Percentage, Noncontrolling Owner	51.00%
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE, shares	75.4	75.2	75.0
BALANCE	$ 0.8	$ 0.8	$ 0.8
Shares Issued Under Share Based Compensation Plans, Shares	0.8	0.2	0.2
BALANCE, shares	76.2	75.4	75.2
BALANCE	$ 0.8	$ 0.8	$ 0.8
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	1,119.8	1,097.9	1,083.0
Stock Issued During Period, Value, New Issues			(2.5)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	4.1
Noncontrolling Interest, Increase from Sale of Parent Equity Interest	(8.4)
BALANCE	1,113.3	1,119.8	1,097.9
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	1,025.5	160.1	(16.4)
Net income	373.4	865.4	176.5
BALANCE	1,398.9	1,025.5	160.1
AOCI [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	25.2	14.7	(9.1)
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	10.9	10.8	23.8
Net other comprehensive income (loss)	(1.9)	(0.3)
BALANCE	34.2	25.2	14.7
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	9.4	8.0	2.7
Net income	(3.6)	1.4	5.3
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(8.4)
Noncontrolling Interest, Increase from Sale of Parent Equity Interest	8.4
BALANCE	5.8	9.4	8.0
Warrant
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	16.4	16.4	16.4
BALANCE	16.4	16.4	16.4
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	(200.1)	0.0	0.0
Treasury Stock, Value, Acquired, Cost Method	(125.0)	(200.1)
BALANCE	$ (325.1)	$ (200.1)	$ 0.0

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