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Share-Based Payments - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2015
shares
Dec. 31, 2020
USD ($)
Increment
Plan
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2013
Increment
Jun. 30, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award            
Unrecognized compensation cost related to unvested share-based compensation   $ 207.6        
Weighted-average period to recognize the cost of unvested awards   1 year 10 months 24 days        
Number of share-based compensation plans pursuant to which awards are currently being made | Plan   3        
Total intrinsic value of options exercised   $ 2.9 $ 4.2 $ 4.0    
Shares issued under the 2015 ESPP (in shares) | shares 6.2          
Market stock units            
Share-based Compensation Arrangement by Share-based Payment Award            
Number of equal annual increments | Increment   3     4  
Percentage of earnings of the target number of units granted based on actual stock performance   0.00%     0.00%  
Percentage of earnings of the target number of units granted based on actual stock performance   200.00%     150.00%  
Number of days for calculation of average closing stock price   30 days        
Total fair value of vested awards   $ 26.9 $ 32.5 $ 26.9    
Granted (in dollars per share) | $ / shares   $ 398.61 [1] $ 378.08 $ 378.85    
Cash settled performance units            
Share-based Compensation Arrangement by Share-based Payment Award            
Number of equal annual increments | Increment   3        
Percentage of earnings of the target number of units granted based on actual stock performance   0.00%        
Percentage of earnings of the target number of units granted based on actual stock performance   200.00%        
Number of days for calculation of average closing stock price   30 days        
Cash settlement of awards upon vesting   $ 3.8 $ 10.6 $ 15.1    
Performance units            
Share-based Compensation Arrangement by Share-based Payment Award            
Number of equal annual increments | Increment   3        
Percentage of earnings of the target number of units granted based on actual stock performance   0.00%        
Percentage of earnings of the target number of units granted based on actual stock performance   200.00%        
Number of days for calculation of average closing stock price   30 days        
Cash settlement of awards upon vesting   $ 3.4 10.4 17.0    
Performance stock units settled in stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period   3 years        
Percentage of earnings of the target number of units granted based on actual stock performance   0.00%        
Percentage of earnings of the target number of units granted based on actual stock performance   200.00%        
Granted (in dollars per share) | $ / shares [2]   $ 293.35        
Performance stock units settled in cash            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period   3 years        
Percentage of earnings of the target number of units granted based on actual stock performance   0.00%        
Percentage of earnings of the target number of units granted based on actual stock performance   200.00%        
Number of days for calculation of average closing stock price   30 days        
Time-vested restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period   3 years        
Total fair value of vested awards   $ 140.5 $ 131.5 $ 111.7    
Granted (in dollars per share) | $ / shares   $ 318.87 [3] $ 304.44 $ 316.32    
Time-vested restricted stock units | Share-based Payment Arrangement, Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting percentage   33.33%        
Time-vested restricted stock units | Share-based Payment Arrangement, Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting percentage   33.33%        
Time-vested restricted stock units | Share-based Payment Arrangement, Tranche Three            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting percentage   33.33%        
Share-based Payment Arrangement, Option            
Share-based Compensation Arrangement by Share-based Payment Award            
Share based payment arrangement, term   10 years        
Share-based Payment Arrangement, Option | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period   1 year        
Share-based Payment Arrangement, Option | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period   4 years        
Directors Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Total number of shares of common stock for issuance (in shares) | shares   1.6        
Ratio of total number of shares reserved under the plan   1.5        
2017 Omnibus Equity Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Ratio of total number of shares reserved under the plan   1.5        
Omnibus Plan number of shares authorized (in shares) | shares           8.0
[1] MSUs granted during 2020 include awards granted in conjunction with our annual awards made in February 2020 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant. MSUs granted in 2020 also reflect an adjustment based upon the final performance multiplier in relation to shares granted in 2019, 2018 and 2017.
[2] PSUs settled in stock granted in 2020 include awards granted in conjunction with our annual awards made in February 2020 and PSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
[3] RSUs granted in 2020 primarily represent RSUs granted in conjunction with our annual awards made in February 2020 and awards made in conjunction with the hiring of new employees. RSUs granted in 2020 also include approximately 10,000 RSUs granted to our Board of Directors.