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Stock-based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Nov. 27, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) | shares 2,558,933 2,558,933      
Conversion rate (one for every two)         0.5
Stock based compensation expense   $ 21.3 $ 41.2 $ 26.5  
Tax benefit from exercise of stock options   5.5 10.1 6.6  
Excess tax benefit from share-based compensation, operating activities   $ 0.2 $ 2.6 $ 4.8  
Stock options granted (in shares) | shares   150,000 400,000 293,000  
Aggregate intrinsic value of options exercised   $ 1.0 $ 24.9 $ 6.5  
Fair value of options vested   $ 1.0 7.8 4.6  
Continuing Operations          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock based compensation expense     $ 5.4 $ 5.4  
2015 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Unexercised options lapse period (in years)   10 years      
2001 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Unexercised options lapse period (in years)   10 years      
Employee Matters Agreement          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Incremental compensation expense   $ 5.2      
Retirement-Related Modifications          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Converted wards, incremental cost   4.5      
Converted awards, incremental cost related to accelerated vesting of equity awards   $ 8.7      
Converted awards, incremental cost recognized $ 13.2        
Employee Stock          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) | shares 37,270 37,270      
Unrecognized compensation expense related to non-vested award $ 30.6 $ 30.6      
Unrecognized compensation expense related to non-vested award, recognition period (in years)   1 year 8 months 15 days      
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 39.62 $ 38.55 $ 42.07  
Employee Stock | Minimum | 2015 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   1 year      
Employee Stock | Minimum | 2001 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   1 year      
Employee Stock | Maximum | 2015 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   3 years      
Employee Stock | Maximum | 2001 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   5 years      
Stock options          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Dividend Yield   0.00% 0.40% 0.30%  
Restricted Stock          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock granted (in shares) | shares   521,000 375,000 225,000  
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 44.44 $ 41.45 $ 54.28  
Total fair value of shares vesting   $ 7.8 $ 10.5 $ 14.6  
Restricted Stock | Minimum | 2015 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   1 year      
Restricted Stock | Maximum | 2015 Incentive Award Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   3 years      
Performance Share Units          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total fair value of shares vesting   $ 7.1 $ 18.4 $ 22.1  
Performance Share Units | Minimum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Performance percentage   0.00%      
Performance criteria is met | Performance Share Units          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Award vesting rights (percentage)   33.33%      
One-year service period | Performance Share Units          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Award vesting rights (percentage)   33.33%      
One-year service period | Performance Share Units | Minimum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   1 year      
One-year service period | Performance Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting period (in years)   3 years      
Two-year service period | Performance Share Units          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Award vesting rights (percentage)   33.33%      
Terms and conditions scenario 1 | Performance Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Performance percentage   100.00%      
Terms and conditions scenario 2 | Performance Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Performance percentage   200.00%      
Terms and conditions scenario 3 | Performance Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Performance percentage   260.00%      
Terms and conditions scenario 4 | Performance Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Performance percentage   400.00%