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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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) 3,570,891    
Stock based compensation expense $ 41.2 $ 26.5 $ 28.2
Tax benefit from exercise of stock options 10.1 6.6 6.9
Excess tax benefit from share-based compensation, operating activities $ 2.6 $ 4.8 $ 5.7
Stock options granted (in shares) 400,000 293,000 361,000
Aggregate Intrinsic value of options exercised $ 24.9 $ 6.5 $ 6.6
Fair value of options vested 7.8 4.6 3.5
Continuing Operations      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock based compensation expense $ 35.8 $ 21.2 $ 21.3
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]      
Allocated Share Based Compensation Expense, Award Modifications $ 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) 75,314    
Unrecognized compensation expense related to non-vested award $ 13.5    
Unrecognized compensation expense related to non-vested award, recognition period (in years) 1 year 4 months 2 days    
Weighted average grant date fair value (in dollars per share) $ 38.55 $ 42.07 $ 35.74
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    
Restricted Stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock granted (in shares) 375,000 225,000 248,000
Weighted average grant date fair value (in dollars per share) $ 41.45 $ 54.28 $ 46.01
Total fair value of shares vesting $ 10.5 $ 14.6 $ 24.8
Restricted Stock | Executive Officer Performance Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Vesting period (in years) 3 years    
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 | Minimum | 2001 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    
Restricted Stock | Maximum | 2001 Incentive Award Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Vesting period (in years) 5 years    
Performance Share Units      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total fair value of shares vesting $ 18.4 $ 22.1 $ 22.6
Performance Share Units | Minimum      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Performance percentage 0.00%    
Performance Share Units | Maximum      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Performance percentage 200.00%    
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]      
Vesting period (in years) 1 year    
Award vesting rights (percentage) 33.33%    
Award requisite service period (in years) 1 year    
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%    
Award requisite service period (in years) 2 years