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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Net | $ 286.2 |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 8.8 |
Goodwill [Roll Forward] |  |
Goodwill | 2,141.5 | $ 1,907.9
Additions, net of adjustments | 539.8 | 288.3
Impact of exchange rate movements | (102.0) | (54.7)
Goodwill | 2,579.3 | 2,141.5
LaSalle [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 17.6 | 18.4
Additions, net of adjustments | 0.0 | 0.0
Impact of exchange rate movements | (2.2) | (0.8)
Goodwill | 15.4 | 17.6
Americas [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,161.1 | 1,008.3
Additions, net of adjustments | 244.3 | 153.7
Impact of exchange rate movements | 0.7 | (0.9)
Goodwill | 1,406.1 | 1,161.1
EMEA [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 696.2 | 650.4
Additions, net of adjustments | 253.8 | 92.7
Impact of exchange rate movements | (98.3) | (46.9)
Goodwill | 851.7 | 696.2
Asia Pacific [Member] | Reportable Subsegments [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 266.6 | 230.8
Additions, net of adjustments | 41.7 | 41.9
Impact of exchange rate movements | (2.2) | (6.1)
Goodwill | $ 306.1 | $ 266.6

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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=64834752&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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