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Stock Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Expected life - years                   5 years 5 years
Increments for vesting (percent)                 25.00%    
Recognized stock-based compensation expense before tax                 $ 3.6 $ 4.9 $ 4.8
Recognized Stock-based compensation expense after tax                 $ 2.7 $ 3.7 $ 3.7
Diluted earnings per share (in dollars per share) $ 0.69 $ 1.16 $ 0.82 $ 1.06 $ 1.48 $ 0.84 $ 1.20 $ 1.19 $ 3.72 $ 4.71 $ 3.86
Stock options granted (in shares)                 0    
Total intrinsic value of options exercised                 $ 20.7 $ 13.4 $ 6.7
Net cash proceeds from the exercise of stock options                 37.4 27.5 $ 12.8
Amount accrued for shares settling in cash $ 1.0       $ 1.1       $ 1.0 $ 1.1  
Shares distributed (in shares)                 557,590 539,396 290,287
Grant date fair value of vested shares                 $ 24.4 $ 17.3 $ 11.8
Unrecognized compensation expense related to stock options $ 22.5               $ 22.5    
Unrecognized compensation expense is expected to be recognized over a total weighted average period                 2 years    
Number of shares available for future grants for all plans (in shares) 7,800,000               7,800,000    
Share-based Payment Arrangement, Option                      
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Diluted earnings per share (in dollars per share)                 $ 0.04 $ 0.05 $ 0.05
Share-based Payment Arrangement, Option                      
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Expected life - years                 10 years    
Performance-based restricted stock units                      
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Vesting period                 3 years    
Time-based restricted stock units                      
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Increments for vesting (percent)                 25.00%    
Vesting period                 5 years    
Restricted Stock                      
Share Based Compensation Plans (Additional Textual) [Abstract]                      
Recognized stock-based compensation expense before tax                 $ 19.6 $ 22.3 $ 27.5
Vested (in shares) 1,125,472       1,106,386       1,125,472 1,106,386