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Debt Commitments - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 500.0 | $ 500.0
Less: Current portion of debt | (3.0) | (3.0)
Long-term debt | 497.0 | 497.0
Credit Facility | Unsecured Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Total debt | 365.0 | 365.0
Credit Facility | Letter of Credit Subfacility |  |
Debt Instrument [Line Items] |  |
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation | 36.3 | 36.3
Senior Unsecured Promissory Notes | 2.00% Senior Unsecured Promissory Note Payable |  |
Debt Instrument [Line Items] |  |
Total debt | $ 40.0 | 40.0
Fixed interest rate per annum | 2.00% |
Senior Unsecured Promissory Notes | 2.45% Senior Unsecured Promissory Note Payable |  |
Debt Instrument [Line Items] |  |
Total debt | $ 35.0 | 35.0
Fixed interest rate per annum | 2.45% |
Senior Unsecured Promissory Notes | 3.22% Senior Unsecured Promissory Note Payable |  |
Debt Instrument [Line Items] |  |
Total debt | $ 60.0 | $ 60.0
Fixed interest rate per annum | 3.22% |

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