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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]      
Tax on (loss) gain on derivative instruments $ 12.3 $ (8.0) $ (12.2)
Tax on reclassifications on derivative instruments 5.0 (2.8) 2.0
Tax on foreign currency translation 0.0 (1.0) 13.8
Tax on foreign currency gain and losses on long-term intra-company transactions 0.0 (6.7) 10.6
Tax on benefit plans 7.1 1.4 2.6
Tax on reclassification of benefit plans and prior service costs $ (0.4) $ (0.8) $ (0.6)