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COMBINED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Condensed) Parenthetical - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]    
Pension/postretirement activity, tax $ 0.5 $ 0.6
Deferred (loss)/gain on hedging activity, tax $ 1.1 $ 3.7