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Acquisitions and Divestitures Acquisitions and Divestitures (Tables)
 9 Months Ended
Sep. 30, 2018
Business Combinations [Abstract]  
Acquisitions and Divestitures
Acquisitions
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Acquisitions:
 
 
 
 
 
 
 
Purchase price
$
—

 
$
42.2

 
$
25.0

 
$
48.3

Net cash paid
$
—

 
$
42.2

 
$
25.0

 
$
47.5

Goodwill recorded
$
(0.3
)
 
$
14.8

 
$
9.6

 
$
14.8