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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Restricted Stock Units (RSUs)                
Share-based Payment activity [Roll Forward]                
Unvested at beginning of period (in shares) 939,000.0   1,118,100   912,400 1,096,200 1,096,200  
Granted (in shares) 59,900   23,700   248,400 280,800    
Vested (in shares) (203,700)   (199,600)   (355,100) (417,800)    
Forfeited (in shares) (10,200)   (6,900)   (20,700) (23,900)    
Unvested at end of period (in shares) 785,000.0 939,000.0 935,300 1,118,100 785,000.0 935,300 912,400 1,096,200
Performance Shares [Member]                
Share-based Payment activity [Roll Forward]                
Unvested at beginning of period (in shares) 576,900   545,200   646,000.0 531,500 531,500  
Granted (in shares) 1,600   58,800   114,600 166,000.0    
Vested (in shares) 0   0   (175,100) (79,000.0)    
Forfeited (in shares) (10,600)   (9,400)   (17,600) (23,900)    
Unvested at end of period (in shares) 567,900 576,900 594,600 545,200 567,900 594,600 646,000.0 531,500
Share-based Payment Arrangement [Member]                
Share-based Payment activity [Roll Forward]                
Unvested at beginning of period (in shares) 1,515,900   1,663,300   1,558,400 1,627,700 1,627,700  
Granted (in shares) 61,500   82,500   363,000.0 446,800    
Vested (in shares) (203,700)   (199,600)   (530,200) (496,800)    
Forfeited (in shares) (20,800)   (16,300)   (38,300) (47,800)    
Unvested at end of period (in shares) 1,352,900 1,515,900 1,529,900 1,663,300 1,352,900 1,529,900 1,558,400 1,627,700
Share-based Payment activity, additional disclosures [Abstract]                
Weighted average grant date fair value, beginning of period (in dollars per share) $ 167.23   $ 144.01   $ 152.27 $ 137.42 $ 137.42  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 172.22   205.50   214.90 184.71    
Weighted average grant date fair value, vested (in dollars per share) 141.15   141.21   145.10 146.76    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 158.85   145.07   165.51 140.66    
Weighted average grant date fair value, end of period (in dollars per share) $ 171.51 $ 167.23 $ 147.75 $ 144.01 $ 171.51 $ 147.75 $ 152.27 $ 137.42
Weighted average remaining contractual life, unvested shares outstanding 1 year 10 months 6 days 1 year 11 months 23 days 1 year 11 months 15 days 1 year 11 months 1 day 1 year 10 months 6 days 1 year 11 months 15 days 1 year 11 months 26 days 1 year 8 months 8 days
Unamortized deferred compensation cost $ 99.9       $ 99.9