Note 15 - Leases - Lease Cost (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Operating lease cost(a)		$ 26.6	[1]	$ 25.1	$ 27.5	[1]
Finance lease cost(b)	[2]	0.1		0.2	0.3
Total lease cost		$ 26.7		$ 25.3	$ 27.8
Operating leases, weighed-average remaining lease term (Year)		3 years		3 years 4 months 24 days
Finance leases, weighed-average remaining lease term (Year)		4 years 2 months 12 days		1 year
Operating leases, weighed-average discount rate		3.50%		3.80%
Finance leases, weighed-average discount rate		2.20%		2.50%
Operating cash flows from operating leases		$ 20.2		$ 19.7
Financing cash flows from finance leases		0.1		0.1
Lease assets obtained in exchange for new finance lease liabilities		0.1		0.0
Lease assets obtained in exchange for new operating lease liabilities		$ 15.7		$ 14.8

[1] Includes short-term lease costs of $4.0 million and $3.5 million and variable lease costs of $2.2 million and $1.6 million for the years ended December 31, 2021 and December 31, 2020, respectively.

[2] Includes amortization of leased assets and interest on lease liabilities.