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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill and intangible assets at March 31, 2018 and December 31, 2017 were (in millions):
 
2018
 
2017
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Goodwill
$
10,176.8

 
$
(541.4
)
 
$
9,635.4

 
$
9,871.8

 
$
(534.3
)
 
$
9,337.5

Intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Purchased and internally developed software
$
380.4

 
$
(317.9
)
 
$
62.5

 
$
368.2

 
$
(303.0
)
 
$
65.2

Customer related and other
955.7

 
(593.5
)
 
362.2

 
880.1

 
(576.9
)
 
303.2

 
$
1,336.1

 
$
(911.4
)
 
$
424.7

 
$
1,248.3

 
$
(879.9
)
 
$
368.4


Changes in goodwill for the three months ended March 31, 2018 and 2017 were (in millions):
 
2018
 
2017
January 1
$
9,337.5

 
$
8,976.1

Acquisitions
113.0

 
15.2

Noncontrolling interests in acquired businesses
55.3

 
13.7

Contingent purchase price obligations of acquired businesses
57.3

 
6.2

Foreign currency translation and other
72.3

 
64.0

March 31
$
9,635.4

 
$
9,075.2


Since our annual goodwill impairment test there have been no events that would have triggered a need for an interim impairment test.