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Commitments and Contingencies (Tables)
 3 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Changes in warranty liability
Changes in the Company’s warranty liability during the three months ended December 31, 2017 and 2016 were as follows:

 
 
Three Months Ended 
 December 31,
 
 
2017
 
2016
 
 
(In millions)
Warranty liability, beginning of period
 
$
143.7

 
$
104.4

Warranties issued
 
16.4

 
13.2

Changes in liability for pre-existing warranties
 
6.8

 
2.4

Settlements made
 
(17.5
)
 
(12.2
)
Warranty liability, end of period
 
$
149.4

 
$
107.8
Changes in legal claims reserves
Changes in the Company’s legal claims reserves during the three months ended December 31, 2017 and 2016 were as follows:
 
Three Months Ended 
 December 31,
 
2017
 
2016
 
(In millions)
Reserves for legal claims, beginning of period
$
420.6

 
$
423.5

Increase in reserves
10.6

 
26.3

Payments
(11.5
)
 
(14.2
)
Reserves for legal claims, end of period
$
419.7

 
$
435.6