Note 5 - Leases - Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
2020, operating leases	$ 13.1
2020, finance leases	0.7
2021, operating leases	47.6
2021, finance leases	11.3
2022, operating leases	43.4
2022, finance leases	9.7
2023, operating leases	38.3
2023, finance leases	0.2
2024, operating leases	29.1
2024, finance leases	0.0
2025 and thereafter, operating leases	170.3
2025 and thereafter, finance leases	0.0
Total lease payments, operating leases	341.8
Total lease payments, finance leases	21.9
Less: Amount representing interest, operating leases	(62.4)
Less: Amount representing interest, finance leases	(1.3)
Present value of total lease payments, operating leases	279.4
Present value of total lease payments, finance leases	$ 20.6	$ 7.7