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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis
Our financial assets and liabilities that are measured at fair value on a recurring basis are as follows (in millions):
 
 
 
Fair Value Measurements at Reporting Date Using
As of June 30, 2018
Fair Value
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Valuation Technique (1)
Other current assets:
 
 
 
 
 
 
 
 
 
Current portion of restricted marketable securities
$
9.1

 
$

 
$
9.1

 
$

 
M
Other long-term assets:
 
 
 
 
 
 
 
 
 
Restricted marketable securities
51.9

 

 
51.9

 

 
M
Redeemable noncontrolling interests
223.9

 

 

 
223.9

 
I
As of December 31, 2017
 
 
 
 
 
 
 
 
 
Other current assets:
 
 
 
 
 
 
 
 
 
Current portion of restricted marketable securities
$
17.8

 
$

 
$
17.8

 
$

 
M
Other long-term assets:
 
 
 
 
 
 
 
 
 
Restricted marketable securities
44.2

 

 
44.2

 

 
M
Redeemable noncontrolling interests
220.9

 

 

 
220.9

 
I
(1) The three valuation techniques are: market approach (M), cost approach (C), and income approach (I).
Schedule of Carrying Amounts and Estimated Fair Values, Financial Instruments
The carrying amounts and estimated fair values for all of our other financial instruments are presented in the following table (in millions):
 
As of June 30, 2018
 
As of December 31, 2017
 
Carrying Amount
 
Estimated Fair Value
 
Carrying Amount
 
Estimated Fair Value
Long-term debt:
 

 
 

 
 

 
 

Advances under revolving credit facility
$
150.0

 
$
150.0

 
$
95.0

 
$
95.0

Term loan facilities
287.4

 
288.8

 
294.7

 
296.3

5.125% Senior Notes due 2023
296.3

 
303.0

 
295.9

 
306.8

5.75% Senior Notes due 2024
1,194.3

 
1,212.0

 
1,193.9

 
1,228.5

5.75% Senior Notes due 2025
344.7

 
354.9

 
344.4

 
364.9

Other notes payable
96.3

 
96.3

 
82.3

 
82.3

Financial commitments:
 
 
 
 
 
 
 
Letters of credit

 
38.1

 

 
35.4