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Debt (Other Credit Facilities) (Narrative) (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Letters of credit issued | $ 151.8 |  | $ 115.1 |
Other Credit Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 15.7 | $ 20,000,000.0 | 15.4 | $ 20,000,000.0
Long-term debt obligations |  | $ 0 |  | $ 0
Line of Credit [Member] | Standby Letters of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit issued | 18.2 |  | $ 17.1 |
Line of Credit [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 50.0 |  |  |
Line of Credit [Member] | Letter of Credit [Member] | Standby Letters of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, interest rate (percentage) | 0.50% | 0.50% | 0.40% | 0.40%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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