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Intangible assets and goodwill (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 712.5 $ 764.1  
Accumulated amortization (495.7) (511.3)  
Intangible Assets, Net (Excluding Goodwill) 216.8 252.8  
Goodwill 585.9 629.3  
Intangible Assets Gross Including Goodwill 1,298.4 1,393.4  
Total intangible assets, accumulated amortization (495.7) (511.3)  
Intangible Assets Net Including Goodwill 802.7 882.1 $ 973.8
In-process research & development (IPR&D)      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 25.4 28.5  
Accumulated amortization 0.0 0.0  
Intangible Assets, Net (Excluding Goodwill) 25.4 28.5  
Patents & Licenses      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 126.5 141.9  
Accumulated amortization (102.1) (103.9)  
Intangible Assets, Net (Excluding Goodwill) 24.4 38.0  
Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 117.7 123.7  
Accumulated amortization (1.1) (0.9)  
Intangible Assets, Net (Excluding Goodwill) 116.6 122.8  
Technologies and dealer relationships      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 442.9 470.0  
Accumulated amortization (392.5) (406.5)  
Intangible Assets, Net (Excluding Goodwill) $ 50.4 $ 63.5