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COMBINED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Condensed) Parenthetical - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Pension/postretirement activity, tax $ 0.2 $ 0.4 $ 0.8 $ 1.2
Deferred (loss)/gain on hedging activity, tax (1.9) $ 2.1 (3.7) $ 4.7
Income tax benefit attributable to discontinued operations $ 0.4   $ (2.5)