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, 2015
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]      
Pension and postretirement, tax $ (2.1) $ (6.5) $ 15.2
Net unrealized (loss) gain on derivative instruments, tax (0.4) (0.1) 0.2
Net unrealized gain (loss) on available-for-sale securities, tax $ 0.0 $ 0.0 $ (0.1)