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Pension and Other Postretirement Benefits Pension Narrative (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Service Cost $ 0.7 $ 0.4 $ 1.3
Defined Benefit Plan, Interest Cost 6.4 6.5 12.9
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (9.5) (8.2) (19.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (2.4) $ (1.3) $ (4.8)