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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Document Fiscal Year Focus |  |  | 2017 |  |
Bronze Commodity Contract [Member] | Cost of Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.0 |
Foreign Exchange Contract [Member] | Other Income Expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (2.1) | 2.9 | (1.4) | 0.8 |
Call options [Member] | Net Realized Investment Gains [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 5.8 | (1.4) | 8.9 | 0.5 |
Embedded Derivatives in Reinsurance Contracts [Member] | Net Realized Investment Gains [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (0.2) | (3.4) |  |  |
Embedded Derivatives in Reinsurance Contracts [Member] | Benefits And Other Changes In Policy Reserves [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | (10.2) | (5.8) |
Spectrum Brands [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (10.4) | (5.4) | 32.8 | (0.8) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 3.8 | 0.7 | 8.6 | 0.9 |
Spectrum Brands [Member] | Interest Rate Swap [Member] | Interest Expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (0.4) | (0.6) | (0.3) | (0.3) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (0.7) | (0.5) | (1.0) | (1.0) |
Spectrum Brands [Member] | Commodity contracts [Member] | Cost Of Goods Sold [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 3.7 | 1.8 | 3.8 | 0.8 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1.7 | (1.6) | 2.5 | (3.0) |
Spectrum Brands [Member] | Net Investment Hedging [Member] | Other Income Expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (9.2) | 0.0 | 23.3 | 0.0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0.0 | 0.0 | 0.0 | 0.0 |
Spectrum Brands [Member] | Bronze Commodity Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Contracts Market Value | 6.1 |  | 6.1 |  | $ 4.0
Spectrum Brands [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Contracts Market Value | 252.9 |  | 252.9 |  | $ 224.8
Spectrum Brands [Member] | Foreign Exchange Contract [Member] | Cost Of Goods Sold [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (4.4) | (6.6) | 5.9 | (1.2) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 2.8 | 2.8 | 7.1 | 4.9 |
Spectrum Brands [Member] | Foreign Exchange Contract [Member] | Sales Revenue, Net [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (0.1) | 0.0 | 0.1 | (0.1) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |

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