XML 150 R126.htm IDEA: XBRL DOCUMENT v3.10.0.1
Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Successor        
Components of net periodic pension costs        
Net periodic postretirement benefit cost   $ (21.9) $ (18.1)  
Successor | Pension Plans, Defined Benefit        
Components of net periodic pension costs        
Service cost for benefits earned   1.6 2.3  
Interest cost on projected benefit obligation   28.0 31.4  
Expected return on plan assets   (33.5) (42.8)  
Amortization of prior service cost   0.0 0.0  
Amortization of actuarial losses   0.0 0.0  
Settlement charge   2.1 0.0  
Net actuarial gain   (23.5) 4.2  
Net periodic postretirement benefit cost   $ (25.3) $ (4.9)  
Predecessor        
Components of net periodic pension costs        
Net periodic postretirement benefit cost $ (14.4)     $ (57.1)
Predecessor | Pension Plans, Defined Benefit        
Components of net periodic pension costs        
Service cost for benefits earned 0.6     2.5
Interest cost on projected benefit obligation 9.7     41.5
Expected return on plan assets (11.0)     (45.3)
Amortization of prior service cost 0.1     0.3
Amortization of actuarial losses 6.3     24.7
Settlement charge 0.0     0.0
Net actuarial gain 0.0     0.0
Net periodic postretirement benefit cost $ 5.7     $ 23.7