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Goodwill and intangible assets - Schedule of Goodwill (Details)
$ in Millions
3 Months Ended
Dec. 31, 2018
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 244.2
Cumulative translation adjustment (0.2)
Ending balance 244.0
Americas  
Goodwill [Roll Forward]  
Beginning balance 228.4
Cumulative translation adjustment (0.1)
Ending balance 228.3
International  
Goodwill [Roll Forward]  
Beginning balance 15.8
Cumulative translation adjustment (0.1)
Ending balance $ 15.7