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Note 15 - Leases - Lease Cost (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating lease cost |  | $ 25.1 | [1] | $ 27.5 | [1] | $ 23.3
Finance lease cost(b) | [2] | 0.2 |  | 0.3 |  | 0.4
Total lease cost |  | $ 25.3 |  | $ 27.8 |  | $ 23.7
Operating leases, weighed-average remaining lease term (Year) |  | 3 years 4 months 24 days |  | 3 years 8 months 12 days |  |
Finance leases, weighed-average remaining lease term (Year) |  | 1 year |  | 1 year 6 months |  |
Operating leases, weighed-average discount rate |  | 3.80% |  | 3.70% |  |
Finance leases, weighed-average discount rate |  | 2.50% |  | 2.50% |  |
Operating cash flows from operating leases |  | $ 19.7 |  | $ 22.7 |  |
Financing cash flows from finance leases |  | 0.1 |  | 0.3 |  |
Lease assets obtained in exchange for new finance lease liabilities |  | 0.0 |  | 0.1 |  |
Lease assets obtained in exchange for new operating lease liabilities |  | $ 14.8 |  | $ 26.4 |  |
[1] | Includes short-term lease costs of $3.5 million and $3.1 million and variable lease costs of $1.6 million and $2.4 million for the years ended December 31, 2020 and December 31, 2019, respectively.
[2] | Includes amortization of leased assets and interest on lease liabilities.

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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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