Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]      
Pension and postretirement, tax $ (10.9) $ (4.8) $ (2.1)
Net unrealized (loss) gain on derivative instruments, tax $ 1.0 $ 0.2 $ (0.4)