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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance $ 1,297.9  
Net income (loss) 48.6 $ (39.8)
Net other comprehensive income (loss) (0.2) $ (0.3)
Ending balance $ 1,352.0  
Common Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance (in shares) 75.2 75.0
Beginning balance $ 0.8 $ 0.8
Ending balance (in shares) 75.2 75.0
Ending balance $ 0.8 $ 0.8
Additional Paid-in Capital    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 1,097.9 1,083.0
Share-based compensation cost 5.7 3.4
Ending balance 1,103.6 1,086.4
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 160.1 (16.4)
Net income (loss) 46.7 (38.6)
Ending balance 206.8 (55.0)
AOCI     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 14.7 (9.1)
Net reclassification adjustment for amounts recognized in net loss as a component of net periodic benefit (0.1)  
Net other comprehensive income (loss) (0.1) (0.3)
Ending balance 14.5 (9.4)
Non-controlling Interest    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 8.0 2.7
Net income (loss) 1.9 (1.2)
Ending balance $ 9.9 $ 1.5