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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Post retirement plans, amortization of actuarial loss included in net income, tax $ 0.1 $ 0.2 $ 0.7 $ 0.5