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Commitments and Contingencies (Tables)
 9 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Changes in warranty liability
Changes in the Company’s warranty liability during the three and nine months ended June 30, 2018 and 2017 were as follows:

 
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
Warranty liability, beginning of period
 
$
162.6

 
$
112.8

 
$
143.7

 
$
104.4

Warranties issued
 
23.6

 
17.6

 
59.3

 
45.9

Changes in liability for pre-existing warranties
 
8.1

 
8.2

 
25.9

 
14.5

Settlements made
 
(17.9
)
 
(18.3
)
 
(52.5
)
 
(44.5
)
Warranty liability, end of period
 
$
176.4

 
$
120.3

 
$
176.4

 
$
120.3
Changes in legal claims reserves
Changes in the Company’s legal claims reserves during the nine months ended June 30, 2018 and 2017 were as follows:
 
Nine Months Ended 
 June 30,
 
2018
 
2017
 
(In millions)
Reserves for legal claims, beginning of period
$
420.6

 
$
423.5

Increase in reserves
47.2

 
86.2

Payments
(60.0
)
 
(56.2
)
Reserves for legal claims, end of period
$
407.8

 
$
453.5