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Earnings (Loss) per Share - Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share Reconciliation        
Net income (loss) $ 75.4 $ (4.2) $ 196.0 $ 88.8
Basic and Diluted earnings (loss) per share        
Basic earnings (loss) per share (usd per share) $ 1.99 $ (0.11) $ 5.10 $ 2.22
Diluted earnings (loss) per share (usd per share) $ 1.98 $ (0.11) $ 5.06 $ 2.21
Shares        
Weighted average number of common shares outstanding - Basic (shares) 37,839 39,537 38,451 39,993
Weighted average additional shares assuming conversion of potential common shares (shares) 295 0 269 245
Shares - diluted basis (shares) 38,134 39,537 38,720 40,238