Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2016

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) [Abstract]

Changes in Accumulated Other Comprehensive Loss [Table Text Block]

Changes in accumulated other comprehensive loss, net of tax, for the years ended December 31, 2016, 2015 and 2014, were as follows:

	Unrealized Gain (Loss) on Available-for-sale Securities		Defined Benefit Pension, Other Postretirement Items (a)		Gain (Loss) on Cash Flow Hedge		Total
Millions
Balance as of December 31, 2013	$(0.1)		$(16.7)		$(0.3)		$(17.1)
Other Comprehensive Income (Loss) Before Reclassifications	(0.3	)	(5.2	)	0.2		(5.3	)
Amounts Reclassified From Accumulated Other Comprehensive Loss	0.1		1.2		—		1.3
Net Other Comprehensive Income (Loss)	(0.2	)	(4.0	)	0.2		(4.0	)
Balance as of December 31, 2014	(0.3	)	(20.7	)	(0.1	)	(21.1	)
Other Comprehensive Income (Loss) Before Reclassifications	(0.4	)	(4.3	)	0.1		(4.6	)
Amounts Reclassified From Accumulated Other Comprehensive Loss	(0.1	)	1.3		—		1.2
Net Other Comprehensive Income (Loss)	(0.5	)	(3.0	)	0.1		(3.4	)
Balance as of December 31, 2015	(0.8	)	(23.7	)	—		(24.5	)
Other Comprehensive Income (Loss) Before Reclassifications	—		(4.1	)	—		(4.1	)
Amounts Reclassified From Accumulated Other Comprehensive Loss	(0.2	)	0.6		—		0.4
Net Other Comprehensive Income (Loss)	(0.2	)	(3.5	)	—		(3.7	)
Balance as of December 31, 2016	$(1.0)		$(27.2)		—		$(28.2)

(a) Defined benefit pension and other postretirement items excluded from our Regulated Operations are recognized in accumulated other comprehensive loss and are subsequently reclassified out of accumulated other comprehensive loss as components of net periodic pension and other postretirement benefit expense. (See Note 15. Pension and Other Postretirement Benefit Plans.)