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Pension Benefits and Postretirement Benefits Other Than Pensions (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
employees
Mar. 31, 2017
USD ($)
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension Plan, Number of Participants and Beneficiaries | employees 9,000  
Defined Benefit Pension Plans, Number of Active Employees | employees 1,600  
Service Cost $ 0.0 $ 0.0
Interest Cost on Projected Benefit Obligation 5.1 5.1
Expected Return on Plan Assets (7.2) (7.7)
Amortization of Accumulated Net Unrecognized Pension Costs 1.0 0.6
Total Expense (Benefit) Recognized $ (1.1) (2.0)
Postretirement Benefits Other than Pensions [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Postretirement Benefit Plan, Number of Retired Employees Covered | employees 475  
Other Postretirement Benefit Plan, Number of Active Employees Covered | employees 200  
Service Cost $ 0.0 0.0
Interest Cost on Projected Benefit Obligation 0.1 0.1
Amortization of Prior Service Credit (0.3) (0.3)
Amortization of Accumulated Net Unrecognized Pension Costs (0.4) (0.4)
Total Expense (Benefit) Recognized $ (0.6) $ (0.6)