Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2020

Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2020 and 2019:


	Three Months Ended Sept. 30, 2020						Three Months Ended Sept. 30, 2019
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at July 1	$	(23.5)	$	(2.5)	$	(26.0)	$	(24.7)	$	(0.2)	$	(24.9)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $0.1, $—, $0.1 and $—, respectively) (a)	0.3		—		0.3		0.3		—		0.3
Net current period other comprehensive income	0.3		—		0.3		0.3		—		0.3
Accumulated other comprehensive loss at Sept. 30	$	(23.2)	$	(2.5)	$	(25.7)	$	(24.4)	$	(0.2)	$	(24.6)