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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beginning balance   $ 1,297.9     $ 1,297.9  
Net income $ (27.3)   $ 112.8   21.3 $ 73.0
Payments for Repurchase of Common Stock 65.0       65.0  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 0.3          
Net other comprehensive income (loss) (0.3)   $ 0.2   (0.5) $ (0.1)
Ending balance $ 1,266.1       $ 1,266.1  
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beginning balance (in shares) 75.2 75.2 75.0 75.0 75.2 75.0
Beginning balance $ 0.8 $ 0.8 $ 0.8 $ 0.8 $ 0.8 $ 0.8
Ending balance (in shares) 75.2 75.2 75.0 75.0 75.2 75.0
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 1,103.6 1,097.9 1,086.4 1,083.0 1,097.9 1,083.0
Share-based compensation cost 7.0 5.7 3.5 3.4    
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     (0.2)      
Ending balance 1,110.3 1,103.6 1,089.7 1,086.4 1,110.3 1,089.7
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 206.8 160.1 (55.0) (16.4) 160.1 (16.4)
Net income (29.4) 46.7 111.6 (38.6)    
Ending balance 177.4 206.8 56.6 (55.0) 177.4 56.6
AOCI             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beginning balance 14.5 14.7 (9.4) (9.1) 14.7 (9.1)
Net reclassification adjustment for amounts recognized in net loss as a component of net periodic benefit   (0.1) (0.1)      
Net other comprehensive income (loss) (0.2) (0.1) 0.3 (0.3)    
Ending balance 14.2 14.5 (9.2) (9.4) 14.2 (9.2)
Treasury Stock, Common            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beginning balance 0.0 0.0     0.0  
Payments for Repurchase of Common Stock (65.0)          
Ending balance (65.0) 0.0     (65.0)  
Non-controlling Interest            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beginning balance 9.9 8.0 1.5 2.7 8.0 2.7
Net income 2.1 1.9 1.2 (1.2)    
Ending balance $ 12.0 $ 9.9 $ 2.7 $ 1.5 $ 12.0 $ 2.7