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Shareholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 07, 2021
May 08, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 31, 2021
Aug. 31, 2019
Aug. 31, 2018
Equity, Class of Treasury Stock [Line Items]                  
Net earnings, net of tax, attributable to noncontrolling interests     $ 4.9 $ 6.0 $ 13.1 $ 32.3      
Dividend declared per share $ 1.26 $ 1.09              
Dividend declared date May 07, 2021 May 08, 2020              
Dividend payable date Jun. 15, 2021 Jun. 15, 2020              
Dividends Payable, Date of Record Jun. 01, 2021 Jun. 01, 2020              
Shares authorized to be repurchased (in shares)             4,000,000.0 6,000,000.0 6,000,000.0
Shares repurchased (in shares)           900,000      
Total cost of shares repurchased           $ 63.8      
August 2021 Authorization                  
Equity, Class of Treasury Stock [Line Items]                  
Shares remaining authorized for repurchase (in shares)     4.0   4.0        
August 2019 Authorization                  
Equity, Class of Treasury Stock [Line Items]                  
Shares repurchased (in shares)         1,500,000 100,000      
Total cost of shares repurchased         $ 150.1        
Shares remaining authorized for repurchase (in shares)     1,900,000   1,900,000        
August 2018 Authorization                  
Equity, Class of Treasury Stock [Line Items]                  
Shares repurchased (in shares)           800,000      
Shares remaining authorized for repurchase (in shares)     0   0        
Non-Controlling Interests                  
Equity, Class of Treasury Stock [Line Items]                  
Net earnings, net of tax, attributable to noncontrolling interests     $ 0.1 $ 0.1 $ 1.0 $ 0.9