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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table provides information by level for assets and liabilities that are measured at fair value on a recurring basis for year ended December 31, 2017 and December 31, 2016:
Description
December 31, 2017
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Assets:
 
 
 
 
 
 
 
Trading securities
$
0.2

 
$
0.2

 
$
—

 
$
—

Description
December 31, 2016
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Assets:
 
 
 
 
 
 
 
Trading securities
$
2.5

 
$
2.5

 
$
—

 
$
—

Liabilities:
 
 
 
 
 
 
 
Contingent consideration associated with CDI acquisition
$
0.3

 
$
—

 
$
—

 
$
0.3