XML 82 R89.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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) 3,772,517    
Stock based compensation expense $ 26.5 $ 28.2 $ 27.4
Tax benefit from exercise of stock options 6.6 6.9 10.4
Excess tax benefit from share-based compensation, operating activities $ 4.8 $ 5.7 $ 1.1
Stock options granted (in shares) 293,000 361,000 518,000
Aggregate Intrinsic value of options exercised $ 6.5 $ 6.6 $ 2.6
Fair value of options vested $ 4.6 $ 3.5 $ 1.7
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 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) 128,134    
Unrecognized compensation expense related to non-vested award $ 24.6    
Unrecognized compensation expense related to non-vested award, recognition period (in years) 1 year 3 months 18 days    
Weighted average grant date fair value (in dollars per share) $ 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) 225,000 248,000 375,000
Weighted average grant date fair value (in dollars per share) $ 54.28 $ 46.01 $ 29.27
Total fair value of shares vesting $ 14.6 $ 24.8 $ 9.9
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 | Minimum | AMP Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Vesting period (in years) 4 years    
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    
Restricted Stock | Maximum | AMP 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]      
Stock granted (in shares) 248,000    
Weighted average grant date fair value (in dollars per share) $ 54.27    
Total fair value of shares vesting $ 22.1 $ 22.6 $ 7.9
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