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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance $ 2,244.3  
Net income (loss) (39.2) $ 25.5
Net other comprehensive income (loss) 1.1 $ (0.1)
Ending balance $ 2,211.5  
Treasury Stock, Shares, Acquired 0.0 0.0
Common Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance (in shares) 76.2 75.4
Beginning balance $ 0.8 $ 0.8
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period 0.1  
Ending balance (in shares) 76.3 75.4
Ending balance $ 0.8 $ 0.8
Additional Paid-in Capital    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 1,113.3 1,119.8
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 5.6 8.0
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (0.3) (0.1)
Ending balance 1,118.6 1,127.7
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 1,398.9 1,025.5
Net income (loss) (37.9) 25.5
Ending balance 1,361.0 1,051.0
AOCI     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 34.2 25.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax (0.2) (0.2)
Net other comprehensive income (loss) 1.3 0.1
Ending balance 35.3 25.1
Treasury Stock, Common    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance (325.1) (200.1)
Ending balance (325.1) (200.1)
Non-controlling Interest    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 5.8 9.4
Net income (loss) (1.3) 0.0
Ending balance $ 4.5 $ 9.4