Accumulated Other Comprehensive Loss

Accumulated OCI for the three months ended March 31, 2017 and 2016, respectively, consisted of:

	As of December 31,			Three Months Ended March 31,		As of March 31,			As of December 31,			Three Months Ended March 31,			As of March 31,
	2016			2017		2017			2015			2016			2016
(Millions)
Gain on revaluation of defined benefit plans, net of income tax expense of $2.8 for 2016	$	(14	)	$	—	$	(14	)	$	(21	)	$	4		$	(17	)
Loss for nonqualified pension plans		(7	)		—		(7	)		(8	)		—			(8	)
Unrealized gain during period on derivatives qualifying as cash flow hedges, net of income tax expense of $1.3 for 2017 and $1.2 for 2016		5			2		7			31			2			33
Reclassification to net income of losses (gains) on cash flow hedges, net of income tax expense (benefit) of $13.6 for 2017 and $(16.6) for 2016(a)		(70	)		23		(47	)		(54	)		(26	)		(80	)
Gain (loss) on derivatives qualifying as cash flow hedges		(65	)		25		(40	)		(23	)		(24	)		(47	)
Accumulated Other Comprehensive Loss	$	(86	)	$	25	$	(61	)	$	(52	)	$	(20	)	$	(72	)

(a)	Reclassification is reflected in the operating expenses line item in the condensed consolidated statements of income.