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Debt Commitments (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Debt Obligations and Letters of Credit Outstanding
Debt obligations and letters of credit outstanding at the end of each period consisted of the following:
 
March 31, 2018
 
December 31, 2017
Outstanding loans under unsecured revolving credit facility
$
270.0

 
280.0

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
405.0

 
415.0

   Less: Current portion of debt
(13.1
)
 
(3.0
)
Long-term debt
$
391.9

 
412.0

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

 
36.3