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Summary of Information Relating to Options Outstanding and Exercisable (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding as of 12/31/2020 12.7  
Weighted Average Remaining Contractual Life 5 years 9 months 18 days  
Options Outstanding Weighted-Average Exercise Price $ 50.72 $ 43.23
Exercisable as of 12/31/2020 7.6  
Options Exercisable Weighted-Average Exercise Price $ 39.92  
0.01 - $20.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 0.01  
Range of Exercise Prices, Upper Limit $ 20.00  
Outstanding as of 12/31/2020 0.1  
Weighted Average Remaining Contractual Life 2 years 6 months  
Options Outstanding Weighted-Average Exercise Price $ 3.44  
Exercisable as of 12/31/2020 0.1  
Options Exercisable Weighted-Average Exercise Price $ 3.44  
$20.01 - $30.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 20.01  
Range of Exercise Prices, Upper Limit $ 30.00  
Outstanding as of 12/31/2020 0.9  
Weighted Average Remaining Contractual Life 1 year 4 months 24 days  
Options Outstanding Weighted-Average Exercise Price $ 26.11  
Exercisable as of 12/31/2020 0.9  
Options Exercisable Weighted-Average Exercise Price $ 26.11  
$30.01 - $40.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 30.01  
Range of Exercise Prices, Upper Limit $ 40.00  
Outstanding as of 12/31/2020 2.5  
Weighted Average Remaining Contractual Life 2 years 10 months 24 days  
Options Outstanding Weighted-Average Exercise Price $ 32.80  
Exercisable as of 12/31/2020 2.5  
Options Exercisable Weighted-Average Exercise Price $ 32.80  
$40.01 - $50.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 40.01  
Range of Exercise Prices, Upper Limit $ 50.00  
Outstanding as of 12/31/2020 2.8  
Weighted Average Remaining Contractual Life 4 years 9 months 18 days  
Options Outstanding Weighted-Average Exercise Price $ 44.24  
Exercisable as of 12/31/2020 2.8  
Options Exercisable Weighted-Average Exercise Price $ 44.21  
50.01 - $60.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 50.01  
Range of Exercise Prices, Upper Limit $ 60.00  
Outstanding as of 12/31/2020 3.1  
Weighted Average Remaining Contractual Life 6 years 10 months 24 days  
Options Outstanding Weighted-Average Exercise Price $ 51.98  
Exercisable as of 12/31/2020 1.3  
Options Exercisable Weighted-Average Exercise Price $ 53.64  
$60.01 - $70.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 60.01  
Range of Exercise Prices, Upper Limit $ 70.00  
Outstanding as of 12/31/2020 0.1  
Weighted Average Remaining Contractual Life 7 years 10 months 24 days  
Options Outstanding Weighted-Average Exercise Price $ 65.52  
Exercisable as of 12/31/2020 0.0  
Options Exercisable Weighted-Average Exercise Price $ 0.0  
$70.01 - $80.00    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 70.01  
Range of Exercise Prices, Upper Limit $ 80.00  
Outstanding as of 12/31/2020 3.2  
Weighted Average Remaining Contractual Life 9 years  
Options Outstanding Weighted-Average Exercise Price $ 75.35  
Exercisable as of 12/31/2020 0.0  
Options Exercisable Weighted-Average Exercise Price $ 0.0