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Note 3 - Financing Arrangements (Details Textual)
$ in Millions
Dec. 31, 2017
USD ($)
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 249.9
Long-term Debt, Maturities, Repayments of Principal in Year Three 241.4
Long-term Debt, Maturities, Repayments Thereafter 594.3
Senior Notes [Member] | Senior Notes, First Issuance [Member]  
Unsecured Debt $ 250.0
Debt Instrument, Interest Rate, Stated Percentage 2.40%
Senior Notes [Member] | Senior Notes, Second Issuance [Member]  
Unsecured Debt $ 250.0
Debt Instrument, Interest Rate, Stated Percentage 3.85%
Senior Notes [Member] | Senior Notes, Third Issuance [Member]  
Unsecured Debt $ 350.0
Debt Instrument, Interest Rate, Stated Percentage 3.30%
Revolving Credit Facility [Member]  
Line of Credit Facility, Maximum Borrowing Capacity $ 500.0
Line of Credit Facility, Maximum Borrowing Capacity, Optional Increase 250.0
Long-term Line of Credit $ 242.2
Debt, Weighted Average Interest Rate 2.52%