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Guarantee Arrangements (Tables)
 12 Months Ended
Sep. 30, 2017
Guarantees [Abstract]  
Schedule of provision for losses on customer guarantees
Changes in the Company’s credit guarantee liability were as follows (in millions):
 
Fiscal Year Ended
September 30,
 
2017
 
2016
Balance at beginning of year
$
8.4

 
$
5.6

Provision for new credit guarantees
3.2

 
4.1

Changes for pre-existing guarantees, net
0.5

 
1.7

Amortization of previous guarantees
(3.1
)
 
(3.0
)
Foreign currency translation
0.1

 
—

Balance at end of year
$
9.1

 
$
8.4