XML 67 R57.htm IDEA: XBRL DOCUMENT v3.22.2.2
Stock Option Plans - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
May 10, 2022
Mar. 15, 2022
Feb. 01, 2022
Mar. 16, 2021
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock Option Plans [Line Items]                        
Compensation expense related to stock option grants         $ 7.5 $ 7.2 $ 5.7 $ 4.7 $ 4.5 $ 3.7 $ 20.4 $ 12.9
Total intrinsic value of options exercised                     135.3 $ 93.6
Total unrecognized compensation cost related to nonvested options         $ 102.9           $ 102.9  
Weighted average period, years                     4 years  
Black-Scholes Option Pricing Model [Member]                        
Stock Option Plans [Line Items]                        
Weighted average fair value per option for all options                     $ 33.25 $ 23.38
Long Term Incentive Plan [Member]                        
Stock Option Plans [Line Items]                        
Stock option granted, Share pool 13,500,000                      
Shares against the pool 3.8                      
Maximum number of shares available 3,500,000                   3,300,000  
Number Of Periods Options Expire                     7 years  
Shares available for grant         13,400,000           13,400,000  
Long Term Incentive Plan [Member] | Officer and Key Employees [Member]                        
Stock Option Plans [Line Items]                        
Shares available for grant   1,141,000 1,197,000                  
Long Term Incentive Plan [Member] | Maximum [Member]                        
Stock Option Plans [Line Items]                        
Minimum exercise price of stock options, percent of fair market value of a share of common stock on the date of grant                     100.00%  
2017 Long Term Incentive Plan [Member] | Officer and Key Employees [Member]                        
Stock Option Plans [Line Items]                        
Shares available for grant       1,640,000                
Stock options granted, exercise percentage, on the third anniversary date of the grant   34.00% 34.00% 34.00%                
Stock options granted, exercise percentage, on the fourth anniversary date of the grant   33.00% 33.00% 33.00%                
Stock options granted, exercise percentage, on the fifth anniversary date of the grant   33.00% 33.00% 33.00%                
2017 Long Term Incentive Plan [Member] | Maximum [Member]                        
Stock Option Plans [Line Items]                        
Maximum period for the exercise of stock options, years                     7 years 7 years
2017 Long Term Incentive Plan [Member] | Minimum [Member]                        
Stock Option Plans [Line Items]                        
Period of service from grant date stock options awarded not subject to forfeiture                     2 years 2 years
2017 Long Term Incentive Plan [Member] | Minimum [Member] | Executive Officer [Member]                        
Stock Option Plans [Line Items]                        
Minimum age of employee with not subject to award forfeiture on condition compliance                     55 years 55 years