Fair Value (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Items Measured At Fair Value On A Recurring Basis

	As of December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Bank time deposits with original maturities of three months or less	$	—	$	176.0	$	—	$	176.0
Derivative assets (see Note S)	—		.6		—		.6
Diversified investments associated with the ESUP* (see Note L)	22.0		—		—		22.0
Total assets	$	22.0	$	176.6	$	—	$	198.6
Liabilities:
Derivative liabilities (see Note S)	$	—	$	14.8	$	—	$	14.8
Liabilities associated with the ESUP* (see Note L)	22.2		—		—		22.2
Total liabilities	$	22.2	$	14.8	$	—	$	37.0

	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Bank time deposits with original maturities of three months or less	$	—	$	140.7	$	—	$	140.7
Derivative assets (see Note S)	—		2.0		—		2.0
Diversified investments associated with the ESUP* (see Note L)	18.8		—		—		18.8
Total assets	$	18.8	$	142.7	$	—	$	161.5
Liabilities:
Derivative liabilities (see Note S)	$	—	$	2.7	$	—	$	2.7
Liabilities associated with the ESUP* (see Note L)	18.6		—		—		18.6
Total liabilities	$	18.6	$	2.7	$	—	$	21.3