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Pensions and Other Postretirement Benefits ABO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Information for pension plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligations $ 39.1 $ 39.2
Accumulated benefit obligations 39.2 37.5
Fair value of plan assets $ 4.7 $ 5.0