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Retirement Plans - Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Benefit Obligation        
Accumulated benefit obligation   $ 175.0 $ 163.0  
Projected benefit obligation at beginning of year   163.0 182.0  
Interest cost   7.0 6.0 $ 7.0
Actuarial loss (gain)   17.0 (13.0)  
Benefits paid   (12.0) (12.0)  
Projected benefit obligation at end of year   175.0 163.0 182.0
Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   150.0 164.0  
Actual return on plan assets   28.0 (7.0)  
Corporation contribution $ 0.9 7.0 5.0  
Benefits paid   (12.0) (12.0)  
Fair value of plan assets at end of year   173.0 150.0 164.0
Funded status of plans   (2.0) (13.0)  
Qualified Pension Plans        
Benefit Obligation        
Accumulated benefit obligation   156.0 145.0  
Projected benefit obligation at beginning of year   145.0 162.0  
Interest cost   6.0 6.0  
Actuarial loss (gain)   15.0 (12.0)  
Benefits paid   (10.0) (11.0)  
Projected benefit obligation at end of year   156.0 145.0 162.0
Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   150.0 164.0  
Actual return on plan assets   28.0 (7.0)  
Corporation contribution   5.0 4.0  
Benefits paid   (10.0) (11.0)  
Fair value of plan assets at end of year   173.0 150.0 164.0
Funded status of plans   17.0 5.0  
Non Qualified Pension Plans        
Benefit Obligation        
Accumulated benefit obligation   19.0 18.0  
Projected benefit obligation at beginning of year   18.0 20.0  
Interest cost   1.0 0.0  
Actuarial loss (gain)   2.0 (1.0)  
Benefits paid   (2.0) (1.0)  
Projected benefit obligation at end of year   19.0 18.0 20.0
Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   0.0 0.0  
Actual return on plan assets   0.0 0.0  
Corporation contribution   2.0 1.0  
Benefits paid   (2.0) (1.0)  
Fair value of plan assets at end of year   0.0 0.0 $ 0.0
Funded status of plans   $ (19.0) $ (18.0)