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Goodwill and Intangibles, net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 1,025.3 | $ 1,024.3
Document Period End Date | Dec. 31, 2017 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 336.4 | $ 297.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 57.5 |
VOBA |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 57.4 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 55.0 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 49.7 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | $ 48.0 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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