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Note 23 - Schedule II Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Balance $ 11.7 $ 5.7 $ 4.6
Charged to Expenses / Against Revenue [1] 13.1 7.2 5.6
Deductions - Write-offs [2] (7.1) (1.2) (4.5)
Balance 17.7 11.7 5.7
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Balance 46.5 34.5 17.6
Charged to Expenses / Against Revenue [1] 10.7 16.7 21.2
Deductions - Write-offs [2] (9.2) (4.7) (4.3)
Balance $ 48.0 $ 46.5 $ 34.5
[1] Primarily additional reserves for bad debts
[2] Primarily accounts receivable balances written off, net of recoveries, the expiration of loss carryforwards and businesses held for sale