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Product Warranty Obligations (Tables)
 3 Months Ended
Dec. 31, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability Changes in product warranty obligations are (in millions):
 
Three Months Ended
December 31,
 
2018
 
2017
Balance at beginning of period
$
27.9

 
$
28.5

Accruals for warranties issued during the current period
5.6

 
6.4

Adjustments to pre-existing warranties
(2.4
)
 
3.9

Settlements of warranty claims
(4.7
)
 
(4.9
)
Balance at end of period
$
26.4

 
$
33.9