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Goodwill and Intangibles, net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 1,029.0 |  | $ 1,029.0 |  | $ 1,024.3
Document Period End Date |  |  | Mar. 31, 2018 |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 314.8 |  | $ 314.8 |  | $ 297.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 57.5 |  | 57.5 |  |
Definite Lived Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangibles | 14.4 | $ 15.1 | 29.4 | $ 30.5 |
VOBA |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 57.4 |  | 57.4 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 55.0 |  | 55.0 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 49.7 |  | 49.7 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | $ 48.0 |  | $ 48.0 |  |

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