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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair value of plan assets at January 1 $ 531.3    
Fair value of plan assets at December 31 555.7 $ 531.3  
Pension Plan and SERP Plan [Member]      
Benefit obligation 459.9 443.6  
Interest cost 11.0 12.6 $ 15.6
Actuarial (gain) loss (9.0) 32.1  
Plan participants’ contributions 0.0 0.0  
Benefits paid (30.2) (28.4)  
Benefit obligation 431.7 459.9 443.6
Accumulated benefit obligation at December 31 431.7 459.9  
Fair value of plan assets at January 1 520.8 488.9  
Actual return on plan assets, net of expenses 54.9 59.6  
Employer contributions, net 0.7 0.7  
Plan participants’ contributions 0.0 0.0  
Benefits paid (30.2) (28.4)  
Fair value of plan assets at December 31 546.2 520.8 488.9
Funded status at December 31 (114.5) (60.9)  
Pension assets, noncurrent (1) [1] (127.0) (74.3)  
Pension, SERP and postretirement benefits, current (2) [2] 1.4 1.0  
Pension, SERP and postretirement benefits, noncurrent (3) [3] 11.1 12.4  
Total Pension, SERP and Postretirement benefits (114.5) (60.9)  
Other Postretirement Benefits Plan [Member]      
Benefit obligation 7.5 8.2  
Interest cost 0.1 0.2 0.3
Actuarial (gain) loss (0.9) (0.2)  
Plan participants’ contributions 1.5 1.6  
Benefits paid (2.2) (2.3)  
Benefit obligation 6.0 7.5 8.2
Accumulated benefit obligation at December 31  
Fair value of plan assets at January 1 10.5 10.3  
Actual return on plan assets, net of expenses (0.2) 0.3  
Employer contributions, net (0.1) 0.6  
Plan participants’ contributions 1.5 1.6  
Benefits paid (2.2) (2.3)  
Fair value of plan assets at December 31 9.5 10.5 $ 10.3
Funded status at December 31 (3.5) (3.0)  
Pension assets, noncurrent (1) [1] (3.5) (3.0)  
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 $ (3.5) $ (3.0)  
[1] Included in "Other noncurrent 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 noncurrent liabilities" in our accompanying consolidated balance sheets