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Divestitures Divestitures - Schedule of assets and liabilities held for sale (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Document Period End Date     Jun. 30, 2017    
Insurance Segment [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax $ 36.1 $ 217.2 $ (35.6) $ 240.7  
Disposal Group, Including Discontinued Operation, Investment 22,767.2   22,767.2   $ 21,160.6
Disposal Group, Including Discontinued Operations, Funds Withheld Receivables 728.6   728.6   671.6
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 821.8   821.8   896.0
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net 6.7   6.7   17.4
Disposal Group, Including Discontinued Operation, Accrued Investment Income 204.5   204.5   213.7
Disposal Group, Including Discontinued Operation, Reinsurance Recoverable 2,352.8   2,352.8   2,344.4
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 24.3   24.3   18.5
Disposal Group, Including Discontinued Operation, Intangible Assets 1,134.2   1,134.2   1,065.5
Disposal Group, Including Discontinued Operation, Other Assets 98.8   98.8   259.4
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell (327.2)   (327.2)   (362.8)
Disposal Group, Including Discontinued Operation, Assets [Abstract]          
Disposal Group, Including Discontinued Operation, Assets 27,811.7   27,811.7   26,284.3
Disposal Group, Including Discontinued Operation, Insurance Reserves 24,515.9   24,515.9   23,404.6
Disposal Group, Including Discontinued Operation, Debt 405.0   405.0   398.8
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities 59.4   59.4   63.1
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Current 14.1   14.1   9.9
Disposal Group, Including Discontinued Operation, Other Liabilities 876.5   876.5   677.4
Disposal Group, Including Discontinued Operation, Liabilities 25,870.9   25,870.9   $ 24,553.8
Front Street RE (Cayman) Ltd. [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax     (22.4)    
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell $ 22.4   $ 22.4