XML 86 R73.htm IDEA: XBRL DOCUMENT v3.5.0.2
Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Components of net periodic benefit cost            
Income tax (benefit) provision $ (12.9) $ 6.9 $ (30.9) $ (108.7) $ (83.2)  
Pension Plans, Defined Benefit [Member]            
Components of net periodic benefit cost            
Service cost for benefits earned 0.7 0.7   2.0 2.0  
Interest cost on projected or accumulated postretirement benefit obligation 10.3 10.1   31.0 30.3  
Expected return on plan assets (11.3) (12.0)   (33.9) (36.1)  
Amortization of prior service cost and net actuarial loss 6.3 10.0   18.8 30.4  
Net periodic pension or postretirement benefit cost $ 6.0 8.8   $ 17.9 26.6  
Funding threshhold 80.00%   80.00% 80.00%    
Employer contributions to pension plan       $ 0.6    
Other Pension Plan, Postretirement or Supplemental Plans [Member]            
Components of net periodic benefit cost            
Employer contributions to pension plan $ 0.4     0.5    
Other Postretirement Benefit Plan [Member]            
Components of net periodic benefit cost            
Service cost for benefits earned 2.6 2.8   7.8 8.4  
Interest cost on projected or accumulated postretirement benefit obligation 8.5 8.4   25.6 25.3  
Amortization of prior service cost and net actuarial loss 2.4 4.6   7.1 13.6  
Net periodic pension or postretirement benefit cost $ 13.5 $ 15.8   $ 40.5 $ 47.3  
Scenario, Forecast [Member] | Pension Plans, Defined Benefit [Member]            
Components of net periodic benefit cost            
Estimated contribution in 2016 to pension plan           $ 0.5