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Retirement and Postretirement Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Pension    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
(Gain) loss from remeasurement of benefit plans $ (4.1) $ 3.5