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Fair Value (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Items Measured At Fair Value On A Recurring Basis
 
As of December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Bank time deposits with original maturities of three months or less
$

 
$
236.4

 
$

 
$
236.4

Derivative assets * (see Note R)

 
3.9

 

 
3.9

Diversified investments associated with the ESUP * (see Note K)
34.0

 

 

 
34.0

Total assets
$
34.0

 
$
240.3

 
$

 
$
274.3

Liabilities:
 
 
 
 
 
 
 
Derivative liabilities * (see Note R)
$

 
$
1.9

 
$

 
$
1.9

Liabilities associated with the ESUP * (see Note K)
34.4

 

 

 
34.4

Total liabilities
$
34.4

 
$
1.9

 
$

 
$
36.3


 
As of December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Bank time deposits with original maturities of three months or less
$

 
$
145.8

 
$

 
$
145.8

Derivative assets (see Note R)

 
.8

 

 
.8

Diversified investments associated with the ESUP * (see Note K)
26.8

 

 

 
26.8

Total assets
$
26.8

 
$
146.6

 
$

 
$
173.4

Liabilities:
 
 
 
 
 
 
 
Derivative liabilities * (see Note R)
$

 
$
4.1

 
$

 
$
4.1

Liabilities associated with the ESUP * (see Note K)
25.6

 

 

 
25.6

Total liabilities
$
25.6

 
$
4.1

 
$

 
$
29.7