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Supplementary Data Property and Equipment (Tables)
 12 Months Ended
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