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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations are (in millions):
 
Six Months Ended
March 31,
 
2018
 
2017
Balance at beginning of period
$
28.5

 
$
28.0

Accruals for warranties issued during the current period
12.9

 
12.5

Adjustments to pre-existing warranties
2.7

 
(1.7
)
Settlements of warranty claims
(11.9
)
 
(12.2
)
Balance at end of period
$
32.2

 
$
26.6