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Organization and Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Net income $ 70.9 $ 72.2 $ 174.1 $ 138.4
Net income per common share        
Basic (USD per share) $ 0.73 $ 0.75 $ 1.80 $ 1.48
Diluted (USD per share) $ 0.71 $ 0.73 $ 1.74 $ 1.43
Basic weighted average shares outstanding (in shares) 96.9 95.8 96.6 93.8
Diluted weighted average shares outstanding (in shares) 100.5 99.5 99.8 96.9
Restricted stock units        
Net income per common share        
Effect of potentially dilutive stock options (in shares) 0.5 1.0 0.5 1.1
Warrants        
Net income per common share        
Effect of potentially dilutive stock options (in shares) 3.1 2.7 2.7 2.0
Senior convertible notes        
Net income per common share        
Effect of potentially dilutive stock options (in shares) 0.0 0.0 0.0 0.0