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Note 5 - Impairments (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
  

2023

  

2022

  

2021

 

Properties marketed for sale (1) (2)

 $14.0  $21.6  $2.7 

Other impairments

  -   0.4   0.9 

Total impairment charges

 $14.0  $22.0  $3.6