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Commitments and Contingencies (Tables)
 6 Months Ended
Mar. 31, 2024
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, 2024 and 2023 were as follows:

Three Months Ended
March 31,		Six Months Ended
March 31,
 2024202320242023
 (In millions)
Warranty liability, beginning of period$531.8 $464.0 $512.4 $454.3 
Warranties issued53.3 44.0 98.4 83.9 
Changes in liability for pre-existing warranties(12.0)(4.0)(7.5)(2.9)
Settlements made(28.5)(29.3)(58.7)(60.6)
Warranty liability, end of period$544.6 $474.7 $544.6 $474.7 
Changes in legal claims reserves
Changes in the Company’s legal claims reserves during the six months ended March 31, 2024 and 2023 were as follows:

Six Months Ended
March 31,
20242023
(In millions)
Reserves for legal claims, beginning of period$858.9 $729.1 
Increase in reserves 39.8 58.7 
Payments(49.4)(19.5)
Reserves for legal claims, end of period$849.3 $768.3