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Unusual Items (Tables)
 3 Months Ended
Mar. 31, 2017
Unusual or Infrequent Items, or Both [Abstract]  
Summary of Unusual Items Expense
Total unusual items expense, comprised of a component of other expense, net and loss on debt in the unaudited condensed consolidated statements of operations, was as follows:
 
Three months ended March 31,
 
2017
 
2016
 
(In millions)
Unusual items
 
 
 
Legal related matters
$
(0.6
)
 
$
(0.1
)
Loss on debt
—

 
0.3

Acquisition costs
1.0

 
—

 
$
0.4

 
$
0.2