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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | $ 284.0 |
Identifiable intangibles with indefinite useful lives | 8.8 |
Goodwill [Line Items] |  |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 6.5 | $ 4.3
Goodwill [Roll Forward] |  |
Goodwill | 2,709.3 | 2,579.3
Goodwill Additions, net of adjustments | 8.9 | 29.2
Goodwill, Translation Adjustments | (35.3) | 60.4
Goodwill | 2,682.9 | 2,668.9
Investment Management [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 16.5 | 15.4
Goodwill Additions, net of adjustments | 0.0 | 0.0
Goodwill, Translation Adjustments | (0.3) | 0.7
Goodwill | 16.2 | 16.1
Americas [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,412.2 | 1,406.1
Goodwill Additions, net of adjustments | 6.9 | 4.5
Goodwill, Translation Adjustments | (0.8) | 0.4
Goodwill | 1,418.3 | 1,411.0
EMEA [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 957.6 | 851.7
Goodwill Additions, net of adjustments | 0.1 | 18.2
Goodwill, Translation Adjustments | (27.7) | 52.1
Goodwill | 930.0 | 922.0
Asia Pacific [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 323.0 | 306.1
Goodwill Additions, net of adjustments | 1.9 | 6.5
Goodwill, Translation Adjustments | (6.5) | 7.2
Goodwill | 318.4 | $ 319.8
Other Intangible Assets [Member] |  |
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | 95.5 |
Mortgage servicing rights [Member] |  |
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | $ 188.5 |

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. + References No definition available. + Details
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- Definition Amount after 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 after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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