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Debt Commitments - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt | $ 415.0 | $ 390.0 |
Less: Current portion of debt | (3.0) | (10.5) |
Long-term debt | 412.0 | 379.5 |
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 280.0 | 305.0 |
Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation | $ 36.3 | 36.3 |
Senior Unsecured Promissory Notes [Member] | 2.00% Senior Unsecured Promissory Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate per annum | 2.00% |  |
Total debt | $ 40.0 | 40.0 |
Senior Unsecured Promissory Notes [Member] | 2.45% Senior Unsecured Promissory Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate per annum | 2.45% |  |
Total debt | $ 35.0 | 35.0 |
Senior Unsecured Promissory Notes [Member] | 3.22% Senior Unsecured Promissory Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate per annum | 3.22% |  |
Total debt | $ 60.0 | 0.0 |
Note Payable Under Asset Purchase Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate per annum | 0.56% |  |
Total debt | $ 0.0 | $ 10.0 | $ 15.0

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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