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Other Assets (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Assets [Line Items] |  |  |
Prepaid expenses | $ 696.0 | $ 851.0 |
Restricted cash | $ 286.0 | $ 477.0 |
Amortization period of acquired finite-lived intangible assets | 7 years | 5 years |
Other intangible assets, at amortized cost | $ 868.0 | $ 796.0 |
Foreign deferred tax liabilities | 81.0 | 80.0 |
Tax Credit Investments - Affordable Housing partnerships | 798.0 | 578.0 |
Other Assets (Textuals) [Abstract] |  |  |
Goodwill impaired | 1.0 | 219.0 |
Accumulated goodwill impairment losses | 220.0 | 219.0 |
Amortization expense | 194.0 | 183.0 | $ 174.0
Sale of Concur Technologies | 10.0 | 0.0 | 990.0
Gain on sale of investments in Concur Technologies | 0.0 | 0.0 | $ 744.0
Community Reinvestment Act Tax Credit Investments | 824.0 | 638.0 |
Other Expense [Member] |  |  |
Other Assets [Line Items] |  |  |
Loss from Affordable Housing Projects Equity Method Investments | 43.0 | 50.0 |
Income Tax Provision [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH Tax Credits for equity method losses | 63.0 | 53.0 |
Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH Investment Commitment | 266.0 |  |
Variable Interest Enterprise [Member] |  |  |
Other Assets [Line Items] |  |  |
Restricted cash | 38.0 | 155.0 |
Affordable Housing Program Off Balance Sheet Obligation | 151.0 |  |
Tax Credit Investments - Affordable Housing partnerships | 701.0 | 489.0 |
Variable Interest Enterprise [Member] | Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH Investment Commitment | $ 239.0 |  |
Earliest Year [Member] |  |  |
Other Assets [Line Items] |  |  |
Affordable Housing Tax Credits Commitment Year To Be Paid | 2017 |  |
Latest Year [Member] |  |  |
Other Assets [Line Items] |  |  |
Affordable Housing Tax Credits Commitment Year To Be Paid | 2029 |  |
Customer Relationships [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | $ 730.0 | 670.0 |
Other Contracts [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | $ 138.0 | $ 126.0 |
Minimum [Member] |  |  |
Other Assets [Line Items] |  |  |
Intangible Assets, Useful Life | 1 year | 5 years |
Maximum [Member] |  |  |
Other Assets [Line Items] |  |  |
Intangible Assets, Useful Life | 22 years | 7 years |

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