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Pension Benefits and Postretirement Benefits Other Than Pensions (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
employees
Sep. 30, 2017
USD ($)
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 $ 0.0 $ 0.0
Interest Cost on Projected Benefit Obligation 5.0 5.1 15.2 15.4
Expected Return on Plan Assets (7.3) (7.7) (21.7) (23.2)
Amortization of Accumulated Net Unrecognized Pension Costs 1.1 0.7 3.2 2.0
Total Expense (Benefit) Recognized (1.2) (1.9) $ (3.3) (5.8)
Postretirement Benefits Other than Pensions [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Postretirement Benefit Plan, Number of Retired Employees Covered | employees     600  
Other Postretirement Benefit Plan, Number of Active Employees Covered | employees     600  
Service Cost 0.0 0.0 $ 0.1 0.1
Interest Cost on Projected Benefit Obligation 0.1 0.1 0.3 0.3
Amortization of Prior Service Credit (0.5) (0.3) (1.4) (1.0)
Amortization of Accumulated Net Unrecognized Pension Costs (0.3) (0.5) (1.0) (1.4)
Total Expense (Benefit) Recognized $ (0.7) $ (0.7) $ (2.0) $ (2.0)