Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Intangible assets (Details)

v3.5.0.2
Summary of Significant Accounting Policies - Intangible assets (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Future amortization expense      
2017 $ 30.8    
2018 30.4    
2019 30.2    
2020 29.7    
2021 29.0    
Components of intangible assets and the related accumulated amortization      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 2.2 $ 0.0 $ 0.0
Cost 585.4 480.2  
Accumulated amortization (174.2) (144.8)  
Total $ 715.7 604.4  
Minimum      
Components of intangible assets and the related accumulated amortization      
Intangible assets amortization period 3 years    
Maximum      
Components of intangible assets and the related accumulated amortization      
Intangible assets amortization period 21 years    
Trade names      
Components of intangible assets and the related accumulated amortization      
Trade names, indefinite lives $ 130.3 124.2  
Trade names      
Components of intangible assets and the related accumulated amortization      
Cost 0.2 0.2  
Accumulated amortization (0.1) (0.1)  
Customer relationships      
Components of intangible assets and the related accumulated amortization      
Cost 459.5 374.0  
Accumulated amortization (100.7) (78.7)  
Technology, including patents      
Components of intangible assets and the related accumulated amortization      
Cost 77.9 62.3  
Accumulated amortization (33.3) (28.0)  
Software      
Components of intangible assets and the related accumulated amortization      
Cost 47.4 43.3  
Accumulated amortization (39.8) (37.7)  
Other      
Components of intangible assets and the related accumulated amortization      
Cost 0.4 0.4  
Accumulated amortization $ (0.3) $ (0.3)