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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 10, 2025
$ / shares
shares
Jul. 31, 2025
shares
May 31, 2025
shares
Feb. 28, 2025
shares
Sep. 30, 2025
USD ($)
item
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
$ / shares
Mar. 31, 2023
$ / shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Oct. 22, 2024
USD ($)
Share Repurchase Plan                            
Value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $                           $ 1,500.0
Remaining value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $         $ 963.6             $ 963.6    
Shares         211,873 301,279 922,656 1,535,266 1,804,180     1,435,808 3,339,446  
Average Cost Per Share | $ / shares         $ 287.71 $ 265.17 $ 274.41 $ 281.37 $ 287.81     $ 274.43 $ 284.85  
Amount | $         $ 60.9 $ 79.9 $ 253.2 $ 432.0 $ 519.3     $ 394.0 $ 951.3  
Dividends                            
Number of consecutive years of quarterly cash dividends paid | item         66                  
Common stock quarterly dividend per share (in dollars per share) | $ / shares         $ 1.2   $ 1.2 $ 1.1   $ 1.1 $ 1 $ 3.6 $ 3.3  
Additional share-based compensation disclosures                            
Total unrecognized compensation cost | $         $ 73.8             $ 73.8    
Weighted average recognition period for unrecognized compensation cost (in years)         1 year 9 months 18 days             1 year 9 months 18 days    
Q4 2025 Dividends | Subsequent event                            
Dividends                            
Common stock dividend quarterly declared and paid per share (in dollars per share) | $ / shares $ 1.2                          
Dividend date of declaration Oct. 10, 2025                          
Dividend date payable Dec. 05, 2025                          
Dividend date of record Nov. 21, 2025                          
Restricted stock units (RSUs)                            
Additional share-based compensation disclosures                            
Vesting period (in years)   3 years 3 years 3 years               3 years 3 years  
Changes                            
Granted (in shares)   2,261 509 96,973                    
Restricted stock units (RSUs) and performance stock units (PSUs)                            
Common Stock and Additional Paid-In (in Shares)                            
Shares withheld related to share settlements | $                       $ 11.8 $ 29.6  
Changes                            
Unvested as of the beginning of the period (in units) 478,541           327,017         327,017    
Granted (in shares)                       167,931    
Vested (in units)                       (3,969)    
Cancelled or forfeited (in units)                       (12,438)    
Unvested as of the end of the period (in units)         478,541             478,541    
Shares reserved for future issuance (all plans)         1,223,731             1,223,731    
Weighted Average Grant Date Fair Value                            
Unvested as of the beginning of the period (in dollars per unit) | $ / shares $ 278.96           $ 267.96         $ 267.96    
Granted (in dollars per unit) | $ / shares                       299.96    
Vested (in dollars per unit) | $ / shares                       264.48    
Cancelled or forfeited (in dollars per unit) | $ / shares                       277.97    
Unvested as of the end of the period (in dollars per unit) | $ / shares         $ 278.96             $ 278.96    
Performance stock units (PSUs)                            
Additional share-based compensation disclosures                            
Vesting period (in years)   3 years   3 years               3 years 3 years  
Return on assets result period   3 years   3 years               3 years 3 years  
Changes                            
Granted (in shares)   2,261   65,927                    
Performance stock units (PSUs) | Maximum                            
Stock Based Compensation                            
Share of Common Stock   2   2               2 2