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Supplementary Data Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and Equipment
 
 
December 31,
 
 
2016
 
2015
Furniture and equipment
 
$
604.2

 
$
585.1

Leasehold improvements
 
599.8

 
570.1

Internal use computer software
 
306.5

 
295.2

Land and buildings
 
73.1

 
78.7

 
 
1,583.6

 
1,529.1

Less: accumulated depreciation
 
(961.6
)
 
(961.9
)
Total property and equipment, net
 
$
622.0

 
$
567.2