Product Warranty Obligations (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Changes in the product warranty obligations
Balance at beginning of period	$ 38.5	$ 37.3
Accruals for warranties issued during the current period	17.9	18.5
Adjustments to pre-existing warranties	2.0	(3.1)
Settlements of warranty claims	(15.7)	(16.7)
Balance at end of period	$ 42.7	$ 36.0

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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