Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified |
12 Months Ended | |||||
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Sep. 30, 2010
Auction Rate Securities.
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Sep. 30, 2010
Put right.
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Sep. 30, 2011
Forethought Note
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Sep. 30, 2010
Forethought Note
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Sep. 30, 2011
Equity Investments
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Sep. 30, 2009
Equity Investments
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| Reconciliation of changes in Level 3 financial assets | ||||||
| Balance at the beginning of the period | $ 47.2 | $ 1.7 | $ 127.0 | $ 109.0 | $ 3.0 | $ 3.0 |
| Total realized and unrealized gains or (losses): | ||||||
| Included in earnings, net | (1.4) | (1.7) | ||||
| Included in other comprehensive income | 1.5 | |||||
| Change in fair value, disclosure only | 24.2 | 28.0 | ||||
| Purchases, issuances and settlements | (35.4) | (151.2) | (10.0) | |||
| Transfers in and/or (out) of Level 3 | (11.9) | (2.0) | ||||
| Balance at the end of the period | 127.0 | 1.0 | 3.0 | |||
| Yield to maturity (as a percent) | 14.00% | |||||
| Estimated amount by which the fair value of the note and accrued interest is below its carrying value | 17.8 | |||||
| Forethought note principal and interest repayment | $ 151.2 | |||||
| X | ||||||||||
- Definition The net increase or decrease in fair value as compared to carrying value as a result of the changes in the estimates used to calculate the fair value.
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| X | ||||||||||
- Definition Represents the fair value adjustment related to assets on account of valuation.
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| X | ||||||||||
- Definition Amount of principal and interest payment on the note receivable.
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| X | ||||||||||
- Definition Return or interest rate on an investment if that investment is held to maturity.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| X | ||||||||||
- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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