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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		$ 1,997.0			$ 1,997.0
Net income	$ 150.8		$ (27.3)		176.3	$ 21.3
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	(0.3)
Net other comprehensive income (loss)	(0.8)		(0.3)		(0.9)	(0.5)
Payments for Repurchase of Common Stock			$ 65.0			$ 65.0
Ending balance	$ 2,187.4				$ 2,187.4
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance (in shares)	75.4	75.4	75.2	75.2	75.4	75.2
Beginning balance	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8
Ending balance (in shares)	75.4	75.4	75.2	75.2	75.4	75.2
Ending balance	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	1,127.7	1,119.8	1,103.6	1,097.9	1,119.8	1,097.9
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	7.4	8.0	7.0	5.7
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(0.1)	(0.3)
Ending balance	1,134.8	1,127.7	1,110.3	1,103.6	1,134.8	1,110.3
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	16.4	16.4	16.4	16.4	16.4	16.4
Ending balance	16.4	16.4	16.4	16.4	16.4	16.4
Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	1,051.0	1,025.5	206.8	160.1	1,025.5	160.1
Net income	149.6	25.5	(29.4)	46.7
Ending balance	1,200.6	1,051.0	177.4	206.8	1,200.6	177.4
AOCI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	25.1	25.2	14.5	14.7	25.2	14.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(0.2)	(0.2)	(0.1)	(0.1)
Net other comprehensive income (loss)	(0.6)	0.1	(0.2)	(0.1)
Ending balance	24.3	25.1	14.2	14.5	24.3	14.2
Treasury Stock, Common
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(200.1)	(200.1)	0.0	0.0	(200.1)	0.0
Payments for Repurchase of Common Stock			(65.0)
Ending balance	(200.1)	(200.1)	(65.0)	0.0	(200.1)	(65.0)
Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	9.4	9.4	9.9	8.0	9.4	8.0
Net income	1.2	0.0	2.1	1.9
Ending balance	$ 10.6	$ 9.4	$ 12.0	$ 9.9	$ 10.6	$ 12.0

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