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Principles of Consolidation (Tables)
 3 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table summarizes the fair value hierarchy of our financial assets and liabilities carried at fair value on a recurring basis as of March 31, 2018:
 
 
 
Fair Value Measurement Hierarchy
(in millions)
Total Carrying
Value
 
Quoted prices
in active market
(Level 1)
 
Significant
other
observable
inputs (Level 2)
 
Significant
unobservable
inputs
(Level 3)
Restricted amounts held in escrow-current
$
9.1

 
$
9.1

 
$
—

 
$
—

Total assets at fair value
$
9.1

 
$
9.1

 
$
—

 
$
—