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Note 12 - Borrowings and Financing Activities Senior Notes (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.50% | 4.50%
Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.875% | 4.875%
Senior Notes | Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 450.0 |  |
Proceeds from Issuance of Long-term Debt |  | $ 442.2 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.50% |
Senior Notes | Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 450.0 |  |  |
Proceeds from Issuance of Long-term Debt | $ 442.2 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.875% |
Senior Notes | Senior Notes Due 2024 and 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions |  |  | 0.80 |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |

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