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Supplementary Data Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and Equipment
 
 
December 31,
 
 
2017
 
2016
Furniture and equipment
 
$
634.8

 
$
604.2

Leasehold improvements
 
641.5

 
599.8

Internal-use computer software
 
331.3

 
306.5

Land and buildings
 
79.0

 
73.1

Gross property and equipment
 
1,686.6

 
1,583.6

Less: accumulated depreciation
 
(1,036.2
)
 
(961.6
)
Total property and equipment, net
 
$
650.4

 
$
622.0