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Investments - Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 49.1 |  | $ 64.5 | $ 49.1 |  | $ 64.5 | $ 46.4 | $ 78.1 | $ 65.1 | $ 91.6
Total Gains (Losses) Included in Earnings |  |  | (0.3) | (1.3) |  | 0.3 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 6.1 |  | 3.1 | 9.1 |  | 8.1 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 1.0 |  | $ 3.4 | 7.3 |  | 30.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  |  |  | 5.5 |  |  |  |
Net transfer In (Out) of Level 3 (a) | (2.4) | [1] |  | (29.5) | [2] |  |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  |  |  |  |  |  |  |  | $ 14.1
Total Gains (Losses) Included in Earnings |  |  |  |  |  | (0.5) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  | $ 13.6 |  |  |  |
Fixed-maturity securities, available-for-sale [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 20.3 |  |  | 20.3 |  |  |  | 46.2 |  |
Available-for-sale Securities, Debt Securities | 1,543.4 |  |  | 1,543.4 |  |  |  | 1,535.1 |  |
Total investments, Carrying Value | 1,543.4 |  |  | 1,543.4 |  |  |  | 1,535.1 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 1,566.8 |  |  | $ 1,566.8 |  |  |  | $ 1,531.8 |  |
[1] | (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[2] | (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.

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