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Consolidating Financial Information Additional information (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2017 USD ($)
Document Period End Date | Dec. 31, 2017
Asset Management segment [Member] |
Fair Value, Net Asset (Liability) | $ 67.6

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |