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Note 18 - Pension and Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

		Pension Plan and SERP								Postretirement Plan
		2020				2019				2020				2019
Change in benefit obligation:
Benefit obligation at January 1		$	443.6			$	407.8			$	8.2			$	9.7
Interest cost			12.6				15.6				0.2				0.3
Actuarial loss (gain)			32.1				48.2				(0.2	)			(0.4	)
Plan participants’ contributions			—				—				1.6				2.1
Benefits paid			(28.4	)			(28.0	)			(2.3	)			(3.6	)
Federal subsidy on benefits paid			—				—				—				0.1
Benefit obligation at December 31		$	459.9			$	443.6			$	7.5			$	8.2
Accumulated benefit obligation at December 31		$	459.9			$	443.6
Change in plan assets:
Fair value of plan assets at January 1		$	488.9			$	421.3			$	10.3			$	9.7
Actual return on plan assets, net of expenses			59.6				94.9				0.3				0.6
Employer contributions, net			0.7				0.7				0.6				1.4
Plan participants’ contributions			—				—				1.6				2.1
Benefits paid			(28.4	)			(28.0	)			(2.3	)			(3.6	)
Federal subsidies received			—				—				—				0.1
Fair value of plan assets at December 31		$	520.8			$	488.9			$	10.5			$	10.3
Funded status at December 31		$	(60.9	)		$	(45.3	)		$	(3.0	)		$	(2.1	)
Amounts recognized in the consolidated balance sheets consist of:
Pension assets, noncurrent (1)		$	(74.3	)		$	(58.2	)		$	(3.0	)		$	(2.1	)
Pension, SERP and postretirement benefits, current (2)			1.0				0.8				—				—
Pension, SERP and postretirement benefits, noncurrent (3)			12.4				12.1				—				—
Total Pension, SERP and Postretirement benefits		$	(60.9	)		$	(45.3	)		$	(3.0	)		$	(2.1	)

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

		Pension Plan and SERP								Postretirement Plan
		2020				2019				2020				2019
Prior service benefit cost (credit)		$	3.0			$	3.2			$	(0.1	)		$	(0.3	)
Actuarial losses			133.2				137.1				3.1				3.8
Accumulated other comprehensive losses, pretax		$	136.2			$	140.3			$	3.0			$	3.5

						Quoted Prices				Significant
						in Active				Other				Significant
						Markets for				Observable				Unobservable
						Identical Assets				Inputs				Inputs
		Total				(Level 1)				(Level 2)				(Level 3)
December 31, 2020
Equity
Managed equity accounts (1)		$	206.3			$	206.3			$	—			$	—
Equity — pooled separate account (2)			67.2				—				67.2				—
Debt
Fixed income manager — pooled separate account (2)			208.3				—				208.3				—
Fixed income manager — government securities (4)			10.5				10.5				—				—
Others
Cash — pooled separate account (2)			2.1				—				2.1				—
Global real estate account (5)			36.9				—				36.9				—
Total		$	531.3			$	216.8			$	314.5			$	—
December 31, 2019
Equity
Managed equity accounts (1)		$	196.1			$	196.1			$	—			$	—
Equity — pooled separate account (2)			66.1				—				66.1				—
Equity — partnerships (3)			0.1				—				—				0.1
Debt
Fixed income manager — pooled separate account (2)			185.4				—				185.4				—
Fixed income manager — government securities (4)			10.3				10.3				—				—
Others
Cash — pooled separate account (2)			3.4				—				3.4				—
Global real estate account (5)			37.8				—				37.8				—
Total		$	499.2			$	206.4			$	292.7			$	0.1

Schedule of Net Benefit Costs [Table Text Block]

		Pension Plan and SERP												Postretirement Plan
		2020				2019				2018				2020				2019				2018
Interest cost		$	12.6			$	15.6			$	15.2			$	0.2			$	0.3			$	0.3
Expected return on plan assets			(29.9	)			(30.3	)			(32.9	)			(0.2	)			(0.2	)			(0.2	)
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive losses			0.2				0.2				0.2				(0.1	)			(0.1	)			(0.1	)
Amortization of net actuarial loss reclassified from accumulated other comprehensive losses			6.3				4.5				3.2				0.3				0.3				0.4
Net periodic benefit (credit) cost			(10.8	)			(10.0	)			(14.3	)			0.2				0.3				0.4
Amortization of prior service (cost) credit reclassified from accumulated other comprehensive losses			(0.2	)			(0.2	)			(0.2	)			0.1				0.1				0.1
Amortization of actuarial loss reclassified from accumulated other comprehensive losses			(0.2	)			(0.1	)			(0.1	)			—				—				—
Net loss recognized reclassified from accumulated other comprehensive losses			(6.1	)			(4.4	)			(3.1	)			(0.3	)			(0.3	)			(0.4	)
Actuarial (gain) loss			2.4				(16.4	)			37.0				(0.3	)			(0.8	)			(0.3	)
Total recognized in other comprehensive (income) loss			(4.1	)			(21.1	)			33.6				(0.5	)			(1.0	)			(0.6	)
Total recognized in net periodic benefit (credit) cost and other comprehensive (income) loss		$	(14.9	)		$	(31.1	)		$	19.3			$	(0.3	)		$	(0.7	)		$	(0.2	)

Defined Benefit Plan, Assumptions [Table Text Block]

		Pension Plan and SERP												Postretirement Plan
Weighted-average assumptions used to determine benefit obligations:		2020				2019								2020				2019
Discount rate			2.49	%			3.24	%							1.50	%			2.50	%
Expected return on plan assets			6.50	%			6.75	%							2.00	%			2.00	%
Cash balance interest credit rate			2.57	%			2.57	%							Not applicable
Weighted-average assumptions used to determine net periodic benefit (credit) loss:		2020				2019				2018				2020				2019				2018
Discount rate			2.83	%			3.82	%			3.50	%			2.50	%			3.75	%			3.00	%
Expected return on plan assets			6.75	%			7.00	%			7.00	%			2.00	%			2.00	%			2.00	%
Cash balance interest credit rate			2.57	%			2.57	%			2.57	%			Not applicable

Schedule of Expected Benefit Payments [Table Text Block]

		Pension Plan				Postretirement
		and SERP				Plan
		Gross				Gross				Medicare				Net
		Benefit				Benefit				Subsidy				Benefit
		Amount				Amount				Payments				Amount
2021		$	30.5			$	1.2			$	(0.2	)		$	1.0
2022		$	30.1			$	1.1			$	(0.2	)		$	0.9
2023		$	30.3			$	1.0			$	(0.2	)		$	0.8
2024		$	29.9			$	0.8			$	—			$	0.8
2025		$	28.9			$	0.7			$	—			$	0.7
2026-2030		$	135.5			$	2.4			$	(0.1	)		$	2.3

Schedule of Allocation of Plan Assets [Table Text Block]

		Target				Percentage of Plan Assets
Asset Category		Allocation				2020				2019
Equity securities			55.0	%			52.5	%			53.7	%
Debt securities			45.0	%			40.0	%			37.9	%
Other			—	%			7.5	%			8.4	%
Total			100.0	%			100.0	%			100.0	%

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