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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 270.1 | $ 465.2 | $ 643.2 | $ 673.6
Fixed maturity securities, available-for-sale: |  |  |  |
Funds Withheld Receivable |  | 0.0 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Asset Backed Loans And Other Invested Assets |  | 33.3 |  |
Liabilities |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,931.0 | 5,761.8 |  |
Reported Value Measurement [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Asset Backed Loans And Other Invested Assets |  | 33.3 |  |
Liabilities |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,705.1 | 5,465.6 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Liabilities |  |  |  |
Debt Instrument, Fair Value Disclosure | 5,839.0 | 5,639.9 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Asset Backed Loans And Other Invested Assets |  | 33.3 |  |
Liabilities |  |  |  |
Debt Instrument, Fair Value Disclosure | 92.0 | 121.9 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Assets, Fair Value Disclosure, Recurring | 1.5 | 0.2 |  |
Derivatives, Liabilities |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 3.3 | 1.7 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Assets, Fair Value Disclosure, Recurring | 0.0 | 0.0 |  |
Derivatives, Liabilities |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Assets, Fair Value Disclosure, Recurring | 1.5 | 0.2 |  |
Derivatives, Liabilities |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 3.3 | 1.7 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |
Assets, Fair Value Disclosure, Recurring | 0.0 | 0.0 |  |
Derivatives, Liabilities |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | $ 0.0 | $ 0.0 |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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