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Acquisitions and Divestitures (Tables)
 9 Months Ended
Sep. 30, 2017
Business Combinations [Abstract]  
Schedule of business acquisitions
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Acquisitions:
 
 
 
 
 
 
 
Purchase price
$
42.2

 
$
—

 
$
48.3

 
$
—

Net cash paid
$
42.2

 
$
—

 
$
47.5

 
$
—

Goodwill recorded
$
14.8

 
$
—

 
$
14.8

 
$
—