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Warranties (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Product Warranty Liability [Line Items]    
Extended product warranty accrual $ 30.8 $ 29.4
Changes in warranty liability    
Balance at beginning of period 98.8 89.6
Warranty provisions 12.0 10.7
Settlements made (12.8) (11.9)
Changes in liability for pre-existing warranties, net 1.2 (1.1)
Premiums received 2.6 2.8
Amortization of premiums received (2.6) (2.9)
Foreign currency translation 0.1 (1.0)
Balance at end of period $ 99.3 $ 86.2
Minimum    
Product Warranty Liability [Line Items]    
Product warranty term 6 months  
Maximum    
Product Warranty Liability [Line Items]    
Product warranty term 5 years