XML 121 R84.htm IDEA: XBRL DOCUMENT v3.24.0.1
Pension - Schedule of Change in Plan Assets and Underfunded Status at End of Year (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of year $ 266,700,000 $ 253,300,000  
Company contributions   0 $ 0
Fair value of plan assets at end of year 253,300,000    
Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 266,700,000 253,300,000 $ 351,400,000
Actual return on plan assets 24,100,000 (81,500,000)  
Benefits paid (16,300,000) (15,900,000)  
Settlements (300,000) 0  
Company contributions 5,900,000 200,000  
Plan combination (acquisitions/divestitures) 0 (800,000)  
Other 0 (100,000)  
Fair value of plan assets at end of year $ 253,300,000 $ 351,400,000