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Stock Compensation - RSU and PSU Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2018
Jun. 30, 2018
Jul. 31, 2016
Jan. 31, 2014
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2016
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Stock Compensation Plans                                
Allocated Share-based Compensation Expense                 $ 42.7 $ 43.8   $ 134.8 $ 132.6      
Stock Options                                
Stock Compensation Plans                                
Vesting period             4 years       3 years          
Stock Options | Tranche One                                
Stock Compensation Plans                                
Percentage of units vesting at the end of each calendar year (as a percent)             25.00%       33.00%          
Vesting period             1 year       1 year          
Stock Options | Tranche Two                                
Stock Compensation Plans                                
Vesting period             36 months       24 months          
Restricted Stock Units (RSUs)                                
Stock Compensation Plans                                
Number of shares awarded for each RSU (in shares)               1                
Percentage of units vesting at the end of each calendar year (as a percent)             25.00%                  
Vesting period             4 years                  
Granted (in shares)           190,000           1,764,067        
Service period                     3 years          
Performance Stock Units (PSUs)                                
Stock Compensation Plans                                
Vesting period 3 years 3 years 4 years   4 years                      
Allocated Share-based Compensation Expense                 $ 1.7 $ 2.7   $ 5.0 $ 11.4      
Granted (in shares) 107,088 92,347 86,975 100,000 77,243 446,500           107,088        
Multiplying factor                           101.80%   83.00%
Performance Stock Units (PSUs) | Minimum                                
Stock Compensation Plans                                
Vesting period           3 years                    
Performance Stock Units (PSUs) | Maximum                                
Stock Compensation Plans                                
Vesting period           4 years                    
Multiplier conversion rate of units into common stock (as a percent) 150.00% 200.00% 125.00%   150.00%                      
Performance Stock Units (PSUs) | Tranche One                                
Stock Compensation Plans                                
Granted (in shares)           106,500                    
Multiplying factor                             142.00%  
Performance Stock Units (PSUs) | Tranche One | Maximum                                
Stock Compensation Plans                                
Multiplying factor           267.00%                    
Performance Stock Units (PSUs) | Tranche Two                                
Stock Compensation Plans                                
Granted (in shares)           150,000                    
Multiplying factor                           100.00%    
Performance Stock Units (PSUs) | Tranche Two | Minimum                                
Stock Compensation Plans                                
Multiplying factor           0.00%                    
Performance Stock Units (PSUs) | Tranche Two | Maximum                                
Stock Compensation Plans                                
Multiplying factor           100.00%                    
Performance Stock Units (PSUs) | Tranche Three                                
Stock Compensation Plans                                
Granted (in shares)           290,000                    
Multiplying factor                 50.00%     50.00%        
Performance Stock Units (PSUs) | Tranche Three | Maximum                                
Stock Compensation Plans                                
Multiplying factor           100.00%