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Fair Value Information
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Information
Fair Value Information
The following fair value information is based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three levels in the hierarchy used to measure fair value are:
Level 1: Unadjusted quoted prices in active markets accessible at the reporting date for identical assets and liabilities.
Level 2: Quoted prices for similar assets or liabilities in active markets. Quoted prices for identical or similar assets and liabilities in markets that are not considered active or financial instruments for which all significant inputs are observable, either directly or indirectly.
Level 3: Prices or valuations that require inputs that are significant to the valuation and are unobservable.
A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.
The following table includes the fair value of our financial instruments for which disclosure of fair value is required (in millions):
 

Fair Value
Hierarchy
Level
 
December 31, 2017
 
December 31, 2016
 
 
Carrying
Amount
 
Estimated
Fair
Value
 
Carrying
Amount
 
Estimated
Fair
Value
Assets
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
1
 
$
219.7

 
$
219.7

 
$
113.7

 
$
113.7

Liabilities
 
 
 
 
 
 
 
 
 
Senior unsecured notes
1
 
247.1

 
259.7

 
246.5

 
256.4

Debt
2
 
333.8

 
341.1

 
332.5

 
341.3


Cash equivalents are recorded at cost, which approximates fair value due to their short-term nature.
The fair value of our senior unsecured notes is determined using observable market prices based on trading activity on a primary exchange. For the years ended December 31, 2017 and 2016, there were no transfers among Level 1, 2 or 3 fair value determinations. Transfers between levels occur when there are changes in the observability of inputs. Changes between levels are assumed to occur at the beginning of the year.