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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value
Assets and liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014 are summarized below (in millions):
 
As of December 31, 2015
 
Level 1
Level 2
Level 3
Total
Derivative assets
$

$
4.8

$

$
4.8

Derivative liabilities
$

$
13.8

$

$
13.8

Long-term debt
$

$
297.4

$

$
297.4

Trading securities
$

$
6.6

$

$
6.6


 
As of December 31, 2014
 
Level 1
Level 2
Level 3
Total
Derivative assets
$

$
11.3

$

$
11.3

Derivative liabilities
$

$
20.5

$

$
20.5