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Acquisitions and Divestitures (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Acquisition and divestiture activity
The Company's acquisition and divestiture activities are summarized below:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in millions)
Acquisitions:
 
 
 
 
 
Purchase price
$
63.0

 
$
—

 
$
46.2

Net cash paid
$
47.5

 
$
—

 
$
46.2

Goodwill recorded
$
25.0

 
$
—

 
$
—

 
 
 
 
 
 
Divestitures:
 
 
 
 
 
Proceeds
$
—

 
$
—

 
$
51.3

Gain recognized
$
—

 
$
—

 
$
8.3

Goodwill charged off
$
—

 
$
—

 
$
17.3