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Debt Commitments (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Debt Obligations and Letters of Credit Outstanding
Debt obligations and letters of credit outstanding at year end consisted of the following:
 
2019
 
2018
Outstanding loans under unsecured revolving credit facility
$
210.0

 
365.0

2.00% Senior unsecured promissory note payable
40.0

 
40.0

2.45% Senior unsecured promissory note payable
35.0

 
35.0

3.22% Senior unsecured promissory note payable
60.0

 
60.0

Total debt
345.0

 
500.0

   Less: Current portion of debt
(3.0
)
 
(3.0
)
Long-term debt
$
342.0

 
497.0

 
 
 
 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation
$
36.3

 
36.3