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Fair Value of Financial Instruments - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 5,908.0 | $ 5,700.1
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset Backed Loans And Other Invested Assets |  | 33.3
Debt Instrument, Fair Value Disclosure | 92.0 | 121.9
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset Backed Loans And Other Invested Assets |  | 33.3
Debt Instrument, Fair Value Disclosure | 6,000.0 | 5,822.0
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset Backed Loans And Other Invested Assets |  | 33.3
Debt Instrument, Fair Value Disclosure | $ 5,774.1 | $ 5,525.8

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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