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Note 5 - Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
2021, operating leases $ 37.6  
2021, finance leases 13.7  
2022, operating leases 46.5  
2022, finance leases 11.8  
2023, operating leases 44.4  
2023, finance leases 0.6  
2024, operating leases 36.6  
2024, finance leases 0.1  
2025, operating leases 33.3  
2025, finance leases 0.0  
2026 and thereafter, operating leases 173.3  
2026 and thereafter, finance leases 0.0  
Total lease payments, operating leases 371.7  
Total lease payments, finance leases 26.2  
Less: Amount representing interest, operating leases (64.6)  
Less: Amount representing interest, finance leases (1.4)  
Present value of total lease payments, operating leases 307.1  
Present value of total lease payments, finance leases $ 24.8 $ 24.7