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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and intangible assets at December 31, 2017 and 2016 were (in millions):
 
2017
 
2016
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Goodwill
$
9,871.8

 
$
(534.3
)
 
$
9,337.5

 
$
9,481.4

 
$
(505.3
)
 
$
8,976.1

Intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Purchased and internally developed software
$
368.2

 
$
(303.0
)
 
$
65.2

 
$
342.6

 
$
(270.2
)
 
$
72.4

Customer related and other
880.1

 
(576.9
)
 
303.2

 
862.4

 
(507.4
)
 
355.0

 
$
1,248.3

 
$
(879.9
)
 
$
368.4

 
$
1,205.0

 
$
(777.6
)
 
$
427.4
Changes in Goodwill
Changes in goodwill for the years ended December 31, 2017 and 2016 were (in millions):
 
2017
 
2016
January 1
$
8,976.1

 
$
8,676.4

Acquisitions
19.3

 
311.7

Noncontrolling interests in acquired businesses
18.9

 
74.0

Contingent purchase price obligations of acquired businesses
27.1

 
152.8

Foreign currency translation and other
296.1

 
(238.8
)
December 31
$
9,337.5

 
$
8,976.1