XML 84 R70.htm IDEA: XBRL DOCUMENT v3.24.0.1
Employee Benefit Plans (Accumulated Other Comprehensive Income (Loss), of the Prior Service Costs and Actuarial Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Actuarial Losses [Roll Forward]      
Net change in defined benefit plans arising during the period $ (0.9) $ 14.9 $ 25.5
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense 0.1 1.2 $ 4.4
Pension Plans [Member]      
Actuarial Losses [Roll Forward]      
Actuarial Loss Beginning Balance 32.2    
Net change in defined benefit plans arising during the period 1.1    
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense (0.3)    
Actuarial Loss Ending Balance $ 33.0 $ 32.2