Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive Income (Parenthetical)

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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Pension and postretirement, tax $ 1.0 $ 0.3 $ 1.5 $ 1.8
Change in net unrealized gain (loss) on derivative instruments, tax $ (0.8) $ 0.0 $ 0.8 $ 0.1