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Supplementary Data Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property and Equipment [Abstract] |
Property, Plant and Equipment [Table Text Block] | Property and Equipment
|  | December 31,
|  | 2018 |  | 2017
Furniture and equipment |  | $ | 681.7 |  |  | $ | 634.8 |
Leasehold improvements |  | 629.0 |  |  | 641.5 |
Internal-use computer software |  | 368.5 |  |  | 331.3 |
Land and buildings |  | 146.6 |  |  | 79.0 |
Gross property and equipment |  | 1,825.8 |  |  | 1,686.6 |
Less: accumulated depreciation |  | (1,034.9 | ) |  | (1,036.2 | )
Total property and equipment, net |  | $ | 790.9 |  |  | $ | 650.4 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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