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Goodwill and intangible assets - Schedule of Goodwill (Details)
$ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 230.0
Cumulative translation adjustment 0.1
Ending balance 230.1
Americas  
Goodwill [Roll Forward]  
Beginning balance 213.8
Cumulative translation adjustment (0.2)
Ending balance 213.6
EMEA  
Goodwill [Roll Forward]  
Beginning balance 5.5
Cumulative translation adjustment 0.1
Ending balance 5.6
Asia Pacific  
Goodwill [Roll Forward]  
Beginning balance 10.7
Cumulative translation adjustment 0.2
Ending balance $ 10.9