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Business Segments, Property and Equipment Expenditures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Document Period End Date | Dec. 31, 2019 |  |
Property and equipment expenditures [Abstract] |  |  |
Net investment activity (less than wholly-owned) | $ 79.2 | $ 14.3 | $ 2.3
Payments to Acquire Investment Property (less than wholly-owned) |  | 47.1 |
Property, Plant and Equipment, Additions | 267.0 | 209.0 | 153.7
Net capital expenditures | 187.8 | 161.9 | 151.4
Reportable Subsegments [Member] | Americas [Member] |  |  |
Property and equipment expenditures [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | 135.6 | 109.1 | 62.6
Reportable Subsegments [Member] | EMEA [Member] |  |  |
Property and equipment expenditures [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | 41.6 | 39.0 | 44.5
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |
Property and equipment expenditures [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | 43.4 | 25.4 | 20.3
LaSalle [Member] |  |  |
Property and equipment expenditures [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | 7.6 | 3.0 | 1.2
Corporate [Member] |  |  |
Property and equipment expenditures [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 38.8 | $ 32.5 | $ 25.1

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