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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
New prior service cost $ (0.7) $ (5.1) $ 31.4
Amortization of net loss (1.2) (1.8) (2.5)
Amortization of prior service cost 1.3 1.3 1.3
Effect of one percentage point change in the assumed health care cost trend rates      
Effect of one percentage point increase on total of service and interest cost components 0.9 0.9 0.7
Effect of one percentage point increase on post-retirement benefit obligation 11.5 9.4 10.0
Effect of one percentage point decrease on total of service and interest cost components (0.7) (0.7) (0.5)
Effect of one percentage point decrease on post-retirement benefit obligation $ (8.3) $ (7.4) (7.8)
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans      
Discount rate used to determine obligation (as a percent) 3.40% 3.40%  
Pensions      
Components of Net Periodic Benefit Costs:      
Service cost $ 3.9 $ 3.3 3.3
Interest cost 9.7 9.5 9.4
Expected return on plan assets (13.4) (14.0) (14.1)
Amortization of net loss 5.5 6.4 3.0
Amortization of prior service cost (2.3) (2.3) (2.3)
Net periodic benefit cost 3.4 2.9 (0.7)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
Net loss (gain) 1.6 (1.0) 25.4
New prior service cost   0.1  
Amortization of net loss (3.3) (3.9) (1.8)
Amortization of prior service cost 1.4 1.4 1.4
Total recognized in other comprehensive income (0.3) (3.4) 25.0
Total recognized in net periodic benefit cost and other comprehensive income $ 3.1 $ (0.5) $ 24.3
Weighted Average Assumptions:      
Discount rate (as a percent) 4.40% 4.50% 4.10%
Expected return plan assets (as a percent) 8.00% 8.00% 8.25%
Rate of compensation increase (as a percent) 3.00% 3.00% 3.00%
Projected benefit obligation change     $ 17.6
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)     17.6
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans      
Total obligation $ 225.4 $ 220.2 237.4
Amounts recognized in accumulated other comprehensive income for net loss, net of tax (49.1) (50.8)  
Amount recognized as prior service credit, net of tax 7.7 9.1  
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost (41.4) (41.7)  
Other Post-retirement Benefits      
Components of Net Periodic Benefit Costs:      
Service cost 1.5 1.5 1.1
Interest cost 2.7 2.5 2.6
Amortization of net loss 1.2 2.2 0.6
Net periodic benefit cost 5.4 6.2 4.3
Current liabilities 2.7 2.5  
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
Net loss (gain) 1.2 (1.9) 5.9
Amortization of net loss (0.8) (1.3) (0.4)
Total recognized in other comprehensive income 0.4 (3.2) 5.5
Total recognized in net periodic benefit cost and other comprehensive income $ 5.8 $ 3.0 $ 9.8
Weighted Average Assumptions:      
Discount rate (as a percent) 4.60% 4.60% 4.20%
Rate of compensation increase (as a percent) 3.00% 3.00% 3.00%
Initial health care cost trend rate (as a percent)     7.10%
Initial health care cost trend rate, Pre-65 group (as a percent) 6.60% 6.80%  
Initial health care cost trend rate, Post-65 group (as a percent) 7.20% 7.60%  
Ultimate health care cost trend rate (as a percent) 4.40% 4.40% 4.50%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans      
Total obligation $ 63.6 $ 60.5 $ 62.6
Amounts recognized in accumulated other comprehensive income for net loss, net of tax (4.4) (4.7)  
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost (4.4) (4.7)  
Qualified Pension Plans      
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans      
Total obligation 223.2 218.0  
Nonqualified Pensions Benefits      
Components of Net Periodic Benefit Costs:      
Current liabilities 1.0 1.2  
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans      
Amounts recognized in accumulated other comprehensive income for net loss, net of tax (0.8) (0.8)  
Amount recognized as prior service credit, net of tax 0.4 0.6  
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost $ (0.4) $ (0.2)  
Post Retirement      
Weighted Average Assumptions:      
Projected benefit obligation change     3.9
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)     $ 3.9