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Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Increase (Decrease) in Obligation, Other Postretirement Benefits     $ (103.5)  
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit $ (16.9) $ (5.3) (16.9) $ (3.1)
Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 0.0 0.0 0.1 0.1
Defined Benefit Plan, Interest Cost 1.2 1.9 5.0 5.6
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0.8 0.9 2.4 2.8
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (2.0) (0.4) (3.1) (1.2)
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit (9.9) 0.0 (9.9) 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 8.3 $ 0.6 $ 9.5 $ 1.7