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Note 4 - Financing Arrangements (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Senior Notes [Member] | Senior Notes, First Issuance [Member]    
Unsecured Debt, Total   $ 250.0
Debt Instrument, Interest Rate, Stated Percentage   3.85%
Senior Notes [Member] | Senior Notes, Second Issuance [Member]    
Unsecured Debt, Total   $ 350.0
Debt Instrument, Interest Rate, Stated Percentage   3.30%
Senior Notes [Member] | Senior Notes, Third Issuance [Member]    
Unsecured Debt, Total   $ 700.0
Debt Instrument, Interest Rate, Stated Percentage   3.875%
Senior Notes [Member] | The 2.40% Senior Notes [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.40%  
Repayments of Unsecured Debt $ 250.0  
Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 750.0
Line of Credit Facility, Maximum Borrowing Capacity, Optional Increase   250.0
Long-term Line of Credit, Total   $ 78.1
Debt, Weighted Average Interest Rate   3.42%