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Note 13 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plan and SERP Plan [Member]    
Interest cost $ 2.8 $ 3.3
Expected return on plan assets (8.2) (7.6)
Amortization of net actuarial loss 1.0 1.0
Net periodic benefit (4.4) (3.3)
Employer contributions (refunds), net 0.2 0.2
Other Postretirement Benefits Plan [Member]    
Interest cost 0.0 0.0
Expected return on plan assets (0.1) 0.0
Amortization of net actuarial loss 0.1 0.0
Net periodic benefit 0.0 0.0
Employer contributions (refunds), net $ (0.4) $ (0.4)