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Pension Benefits and Postretirement Benefits Other Than Pensions (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
employees
Sep. 30, 2015
USD ($)
May 12, 2016
USD ($)
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Future Effect of Plan Amendment on Net Periodic Benefit Cost         $ 1.3
Defined Benefit Plan, Effect of Curtailments on Projected Benefit Obligation         5.2
Curtailment Gain     $ (3.6)    
Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Future Effect of Plan Amendment on Net Periodic Benefit Cost         0.3
Defined Benefit Plan, Effect of Curtailment on Accumulated Unrecognized Pension Loss         23.3
Defined Benefit Pension Plan, Number of Participants and Beneficiaries | employees     9,200    
Service Cost Earned $ 0.0 $ 2.7 $ 4.8 $ 7.9  
Interest Cost on Projected Benefit Obligation 4.8 6.5 15.2 19.3  
Expected Return on Plan Assets (8.3) (8.8) (24.5) (26.3)  
Amortization of Accumulated Net Unrecognized Pension Costs 0.9 6.1 5.8 18.3  
Curtailment Gain 0.0 0.0 (0.3) 0.0  
Total Expense (Benefit) Recognized (2.6) 6.5 $ 1.0 19.2  
Defined Benefit Pension Plans, Number of Active Employees | employees     1,800    
Postretirement Benefits Other than Pensions [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Other Postretirement Benefit Plan, Number of Retired Employees Covered | employees     500    
Service Cost Earned 0.1 0.0 $ 0.1 0.1  
Interest Cost on Projected Benefit Obligation 0.2 0.3 0.6 0.8  
Amortization of Accumulated Net Unrecognized Pension Costs (0.4) (0.4) (1.1) (1.1)  
Total Expense (Benefit) Recognized $ (0.1) $ (0.1) $ (0.4) $ (0.2)  
Other Postretirement Benefit Plan, Number of Active Employees Covered | employees     225    
Post-Freeze [Member] | Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax         167.9
Amortization Period, Accumulated Unrecognized Pension Loss     25 years    
Pre-Freeze [Member] | Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax         1.6
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax         1.3
Pre-Freeze [Member] | Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax         191.2
Amortization Period, Accumulated Unrecognized Pension Loss     5 years    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax         $ 0.3
Cash and Cash Equivalents [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Contributions by Employer     $ 9.0