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Note 15 - Debt - Short-term and Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Unamortized discount $ 971.3 $ 514.3
Syndicated revolving credit facility debt issuance costs (1.2) (1.6)
Long-term debt 2,342.8 2,699.6
Total debt 3,314.1 3,213.9
Short-term Debt and Current Portion of Long-term Debt [Member]    
Finance lease liabilities, current [1] 11.7 14.4
Long-term Debt [Member]    
Finance lease liabilities, noncurrent [1] 1.6 10.3
The 4.125% Senior Note Maturing September 12, 2022 [Member]    
Current portion of long-term debt 349.6 0.0
Long-term debt   348.9
The 5.800% Senior Note [Member]    
Short-term borrowings 0.0 449.9
The 3.625% Senior Note [Member]    
Long-term debt 489.7 489.3
The 4.125% Senior Note [Member]    
Long-term debt 610.9 612.4
The 4.000% Senior Note [Member]    
Long-term debt 895.9 894.6
The 5.500% Senior Note [Member]    
Long-term debt 345.9 345.7
Line of Credit [Member]    
Syndicated revolving credit facility $ 610.0 $ 50.0
[1] Refer to Note 8. Leases