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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 are summarized below (in millions):
 
As of December 31, 2017
 
Level 1
Level 2
Level 3
Total
Derivative assets
$

$
7.8

$

$
7.8

Derivative liabilities
$

$
17.0

$

$
17.0


 
As of December 31, 2016
 
Level 1
Level 2
Level 3
Total
Derivative assets
$

$
6.5

$

$
6.5

Derivative liabilities
$

$
13.4

$

$
13.4