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 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]        
Pension and postretirement, tax $ 0.4 $ 2.5 $ 0.7 $ 5.0
Change in net unrealized gain (loss) on derivative instruments, tax $ 0.1 $ 0.5 $ 0.1 $ 0.8