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Divestitures - Disposal Groups, Including Discontinued Operations, Disclosure (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash and cash equivalents $ 1,647.6 $ 313.4 $ 270.1 $ 465.2
Other receivables, net 278.4   266.0  
Deferred charges and other assets 61.4   43.7  
Assets 9,080.0   35,849.7  
Disposal Group, Including Discontinued Operation, Assets, Current 1,990.6   28,929.2  
Long Term Debt Current And Non Current 5,822.9   5,705.4  
Accounts Payable and Accrued Liabilities, Current 321.3   373.1  
Selling, acquisition, operating and general expenses 216.1 198.9    
Total operating costs and expenses 619.9 561.0    
Operating income 26.6 41.3    
Interest Expense 75.5 78.7    
Less: Net income attributable to noncontrolling interest 71.5 48.6    
Other income, net 1.0 1.0    
Net income 578.9 260.8    
Net Income (Loss) Attributable to Parent 507.4 212.2    
Other long-term liabilities 105.2   26.2  
Liabilities 7,452.4   33,902.8  
Disposal Group, Including Discontinued Operation, Liabilities, Current 608.2   26,850.6  
Stockholders' Equity Attributable to Parent 820.4   758.0  
Noncontrolling interest 807.2   $ 1,188.9  
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax 445.9 0.0    
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 500.8 302.8    
Insurance Segment [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Other Income   0.0    
Disposal Group, Including Discontinued Operation, Revenue 378.6 323.3    
Disposal Group, Including Discontinued Operation, Benefits and other changes in policy reserves 241.3 8.3    
Disposal Group, Including Discontinued Operation, General and Administrative Expense 52.8 30.7    
Disposal Group, Including Discontinued Operation, Depreciation and Amortization 35.8 120.0    
Disposal Group, Including Discontinued Operation, Operating Expense 329.9 159.0    
Disposal Group, Including Discontinued Operation, Operating Income (Loss) 48.7 164.3    
Disposal Group, Including Discontinued Operation, Interest Expense 3.9 6.1    
Disposal Group, Including Discontinued Operation, Other Expense 0.1      
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax 14.2 (144.5)    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax 476.4 302.7    
Discontinued Operation, Tax Effect of Discontinued Operation 16.5 52.3    
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 459.9 250.4    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest 5.4 21.1    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 454.5 229.3    
Insurance Segment [Member] | Insurance Premiums [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue 6.8 11.2    
Insurance Segment [Member] | Net Investment Income        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue 181.9 250.5    
Insurance Segment [Member] | Gain (Loss) on Investments [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue 154.8 22.6    
Insurance Segment [Member] | Insurance and investment product fees [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue $ 35.1 $ 39.0