Accumulated Other Comprehensive (Loss) Income (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income

The following table presents the changes in the accumulated balances for each component of AOCI (in millions of dollars):

	Year Ended December 31,
	2021			2020			2019
Pension and Other Postretirement Benefits:
Beginning balance	$	(19.8	)	$	(33.2	)	$	(35.6	)
Actuarial gain (loss) arising during the period		8.0			0.4			(0.4	)
Less: income tax (expense) benefit		(1.9	)		(0.1	)		0.1
Net actuarial gain (loss) arising during the period		6.1			0.3			(0.3	)
Prior service (cost) credit arising during the period		(14.0	)		12.3			(2.5	)
Less: income tax benefit (expense)		3.3			(3.0	)		0.6
Net prior service (cost) credit arising during the period		(10.7	)		9.3			(1.9	)
Amortization of net actuarial loss1		0.4			0.4			0.5
Amortization of prior service cost1		3.5			4.7			5.6
Less: income tax expense2		(0.9	)		(1.2	)		(1.4	)
Net amortization reclassified from AOCI to Net (loss) income		3.0			3.9			4.7
Translation impact on Canadian pension plan AOCI balance		—			(0.1	)		(0.1	)
Other comprehensive (loss) income, net of tax		(1.6	)		13.4			2.4
Ending balance	$	(21.4	)	$	(19.8	)	$	(33.2	)
Available for Sale Securities:
Beginning balance	$	—		$	0.3		$	0.3
Unrealized gain on available for sale securities		—			1.3			4.4
Less: income tax benefit (expense)		—			(0.7	)		(1.1	)
Net unrealized gain on available for sale securities		—			0.6			3.3
Reclassification of unrealized loss (gain) upon sale of    available for sale securities3		—			(2.0	)		(4.4	)
Less: income tax benefit2		—			1.1			1.1
Net loss (gain) reclassified from AOCI to Net (loss) income		—			(0.9	)		(3.3	)
Other comprehensive income (loss), net of tax		—			(0.3	)		—
Ending balance	$	—		$	—		$	0.3
Cash Flow Hedges:
Beginning balance	$	1.1		$	(5.6	)	$	(13.4	)
Unrealized gain (loss) on cash flow hedges		63.6			(9.4	)		(9.5	)
Less: income tax (expense) benefit		(15.0	)		2.3			2.3
Net unrealized gain (loss) on cash flow hedges		48.6			(7.1	)		(7.2	)
Reclassification of unrealized (gain) loss upon settlement    of cash flow hedges		(41.9	)		17.4			19.7
Reclassification due to forecasted transactions no longer    probable of occurring		—			0.8			—
Less: income tax benefit (expense)2		9.9			(4.4	)		(4.7	)
Net (gain) loss reclassified from AOCI to Net (loss) income		(32.0	)		13.8			15.0
Other comprehensive income, net of tax		16.6			6.7			7.8
Ending balance4	$	17.7		$	1.1		$	(5.6	)
Fair Value Hedges:
Beginning balance	$	—		$	—		$	—
Unrealized gain (loss) on fair value hedges		—			(1.0	)		—
Less: income tax benefit		—			0.2			—
Net unrealized gain (loss) on fair value hedges		—			(0.8	)		—
Excluded component amortized from OCI to Net (loss) income		—			0.4			—
Reclassification due to cancellation of firm commitment		—			0.6			—
Less: income tax benefit (expense)2		—			(0.2	)		—
Net loss reclassified from AOCI to Net (loss) income		—			0.8			—
Other comprehensive income, net of tax		—			—			—
Ending balance	$	—		$	—		$	—
Foreign Currency Translation:
Beginning balance	$	—		$	(0.1	)	$	(0.1	)
Other comprehensive income, net of tax		—			0.1			—
Ending balance	$	—		$	—		$	(0.1	)
Total AOCI ending balance	$	(3.7	)	$	(18.7	)	$	(38.6	)

^1. Amounts amortized out of AOCI related to pension and other postretirement benefits were included within Net periodic postretirement benefit cost (see Note 5).

^2. Income tax amounts reclassified out of AOCI were included as a component of Income tax benefit (provision).

^3. Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other expense, net. We use the specific identification method to determine the amount reclassified out of AOCI.

^4. As of December 31, 2021, we estimate a net mark-to-market gain before tax of $21.6 million in AOCI will be reclassified into Net (loss) income upon settlement within the next 12 months.