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Note 5 - Debt (Details Textual) € in Millions, $ in Millions |  |  |  | 25 Months Ended | 30 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2018 USD ($) | Oct. 13, 2017 USD ($) | Mar. 04, 2016 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 30, 2017 | Nov. 15, 2017 USD ($) | Oct. 12, 2017 USD ($) | Feb. 15, 2017 USD ($) | Dec. 08, 2016 USD ($) | Dec. 08, 2016 EUR (€)
Euro Senior Notes, Series A and B [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  |  |  | € 212
Euro Senior Notes, Series A [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 117.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 1.14% | 1.14%
Euro Senior Notes, Series B [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  |  |  | € 95
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 1.83% | 1.83%
U.S. Senior Notes, Series A and B [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 125.0 |
U.S. Senior Notes, Series A [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 25.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 3.03% |  |
U.S. Senior Notes, Series B [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 100.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 3.74% |  |
US Senior Notes A and B Due 2025 and 2030 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 175.0 |  |  |  |
US Senior Notes, Series A Due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 50.0 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.48% |  |  |  |  |  |  |  |  |  |
US Senior Notes, Series B Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 125.0 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.78% |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  | $ 700.0 |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Uncommitted Borrowing Capacity |  | $ 300.0 | 150.0 |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments |  |  | $ 25.0 |  |  |  |  |  |  |  |
Number of Advances |  | 2 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.13% |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 0.1 |  |  |  |  |  |  |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.15% |  |  |  |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.25% |  |  |  |  |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |  |  |  |  |  |  |  |
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.00% |  |  |  |  |  |  |  |
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 700.0 | $ 575.0 |  |  |  |  | $ 575.0 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 696.9 |  |  |  |  |  |  |
Credit Agreement [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 200.0 | $ 125.0 |  |  |  |  | $ 125.0 |  |  |
Line of Credit Facility, Periodic Payment, Principal |  |  |  | $ 1.6 |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 75.0 | $ 125.0 |  |  |  |  |  |  |  |  |
Debt Instrument, Quarterly Payments, Percentage of Loan |  |  |  |  |  | 1.25% |  |  |  |  |
Debt Instrument, Periodic Payment, Total | $ 2.5 |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment, Principal |  |  |  |  | $ 3.1 |  |  |  |  |  |

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