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Note 18 - Pension and Postretirement Benefits - Summary of Changes in Benefit Obligations and Plan Assets Amount Recognized (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of plan assets at January 1 $ 499.2    
Fair value of plan assets at December 31 531.3 $ 499.2  
Pension Plan and SERP Plan [Member]      
Benefit obligation 443.6 407.8  
Interest cost 12.6 15.6 $ 15.2
Actuarial loss (gain) 32.1 48.2  
Plan participants’ contributions 0.0 0.0  
Benefits paid (28.4) (28.0)  
Federal subsidy on benefits paid 0.0 0.0  
Benefit obligation 459.9 443.6 407.8
Accumulated benefit obligation at December 31 459.9 443.6  
Fair value of plan assets at January 1 488.9 421.3  
Actual return on plan assets, net of expenses 59.6 94.9  
Employer contributions, net 0.7 0.7  
Plan participants’ contributions 0.0 0.0  
Benefits paid (28.4) (28.0)  
Federal subsidies received 0.0 0.0  
Fair value of plan assets at December 31 520.8 488.9 421.3
Funded status at December 31 (60.9) (45.3)  
Pension assets, noncurrent (1) [1] (74.3) (58.2)  
Pension, SERP and postretirement benefits, current (2) [2] 1.0 0.8  
Pension, SERP and postretirement benefits, noncurrent (3) [3] 12.4 12.1  
Total Pension, SERP and Postretirement benefits (60.9) (45.3)  
Other Postretirement Benefits Plan [Member]      
Benefit obligation 8.2 9.7  
Interest cost 0.2 0.3 0.3
Actuarial loss (gain) (0.2) (0.4)  
Plan participants’ contributions 1.6 2.1  
Benefits paid (2.3) (3.6)  
Federal subsidy on benefits paid 0.0 0.1  
Benefit obligation 7.5 8.2 9.7
Accumulated benefit obligation at December 31  
Fair value of plan assets at January 1 10.3 9.7  
Actual return on plan assets, net of expenses 0.3 0.6  
Employer contributions, net 0.6 1.4  
Plan participants’ contributions 1.6 2.1  
Benefits paid (2.3) (3.6)  
Federal subsidies received 0.0 0.1  
Fair value of plan assets at December 31 10.5 10.3 $ 9.7
Funded status at December 31 (3.0) (2.1)  
Pension assets, noncurrent (1) [1] (3.0) (2.1)  
Pension, SERP and postretirement benefits, current (2) [2] 0.0 0.0  
Pension, SERP and postretirement benefits, noncurrent (3) [3] 0.0 0.0  
Total Pension, SERP and Postretirement benefits $ (3.0) $ (2.1)  
[1] Included in "Other assets" in our accompanying consolidated balance sheets
[2] Included in "Accounts payable and accrued liabilities" in our accompanying consolidated balance sheets
[3] Included in "Other liabilities" in our accompanying consolidated balance sheets