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

 
 
Three Months Ended 
 March 31,
 
Six Months Ended 
 March 31,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In millions)
Warranty liability, beginning of period
 
$
107.8

 
$
84.1

 
$
104.4

 
$
82.0

Warranties issued
 
15.1

 
12.3

 
28.3

 
22.9

Changes in liability for pre-existing warranties
 
3.9

 
2.0

 
6.3

 
3.2

Settlements made
 
(14.0
)
 
(10.5
)
 
(26.2
)
 
(20.2
)
Warranty liability, end of period
 
$
112.8

 
$
87.9

 
$
112.8

 
$
87.9
Rollforward of the reserve of legal claims
Changes in the Company’s legal claims reserves during the six months ended March 31, 2017 and 2016 were as follows:
 
Six Months Ended 
 March 31,
 
2017
 
2016
 
(In millions)
Reserves for legal claims, beginning of period
$
423.5

 
$
451.0

Increase in reserves
56.2

 
0.5

Payments
(38.2
)
 
(25.3
)
Reserves for legal claims, end of period
$
441.5

 
$
426.2