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Pension and Other Postretirement Benefits Pension Narrative (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost $ 0.7 $ 0.5 $ 1.0 $ 2.0
Defined Benefit Plan, Interest Cost 6.6 7.7 13.9 19.5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (9.6) (9.4) (17.6) (28.6)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (2.3) $ (1.2) $ (2.7) $ (7.1)