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Note 18 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan and SERP Plan [Member]      
Interest cost $ 17.1 $ 14.7 $ 11.0
Expected return on plan assets (24.1) (28.2) (32.8)
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive income 0.2 0.2 0.2
Amortization of net actuarial loss reclassified from accumulated other comprehensive income 5.2 4.0 3.8
Net periodic (credit) benefit cost (1.6) (9.3) (17.8)
Less: Amortization of prior service (cost) credit reclassified from accumulated other comprehensive income (0.2) (0.2) (0.2)
Less: Amortization of actuarial loss reclassified from accumulated other comprehensive losses (0.1) (0.2) (0.2)
Less: Net loss recognized reclassified from accumulated other comprehensive losses (5.1) (3.8) (3.6)
Actuarial (gain) loss (24.3) 53.5 (31.1)
Total recognized in other comprehensive income (29.7) 49.3 (35.1)
Total recognized in net periodic benefit credit and other comprehensive (income) loss (31.3) 40.0 (52.9)
Other Postretirement Benefits Plan [Member]      
Interest cost 0.2 0.1 0.1
Expected return on plan assets (0.1) (0.2) (0.2)
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive income 0.0 0.0 (0.1)
Amortization of net actuarial loss reclassified from accumulated other comprehensive income 0.4 0.2 0.2
Net periodic (credit) benefit cost 0.5 0.1 0.0
Less: Amortization of prior service (cost) credit reclassified from accumulated other comprehensive income 0.0 0.0 0.1
Less: Amortization of actuarial loss reclassified from accumulated other comprehensive losses 0.0 0.0 0.0
Less: Net loss recognized reclassified from accumulated other comprehensive losses (0.4) (0.2) (0.2)
Actuarial (gain) loss 0.8 1.0 (0.5)
Total recognized in other comprehensive income 0.4 0.8 (0.6)
Total recognized in net periodic benefit credit and other comprehensive (income) loss $ 0.9 $ 0.9 $ (0.6)