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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance $ 1,997.0    
Net income 25.5 $ 48.6  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (0.1)    
Net other comprehensive income (loss) (0.1) (0.2)  
Ending balance 2,030.3    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax $ (0.2) $ (0.1)  
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance (in shares) 75.4 75.2  
Beginning balance $ 0.8 $ 0.8  
Ending balance (in shares) 75.4   75.2
Ending balance $ 0.8   $ 0.8
Additional Paid-in Capital      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 1,119.8 1,097.9  
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 8.0   5.7
Ending balance 1,127.7   1,103.6
Warrants      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 16.4 16.4  
Ending balance 16.4   16.4
Retained Earnings      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 1,025.5 160.1  
Net income 25.5   46.7
Ending balance 1,051.0   206.8
AOCI       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 25.2 14.7  
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax (0.2) (0.1)  
Net other comprehensive income (loss) 0.1   (0.1)
Ending balance 25.1   14.5
Treasury Stock, Common      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance (200.1) 0.0  
Ending balance (200.1) 0.0  
Non-controlling Interest      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance 9.4 $ 8.0  
Net income 0.0   1.9
Ending balance $ 9.4   $ 9.9