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Long-term Debt Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Amortization of financing costs and discounts | $ 2.0 | $ 1.0 | $ 1.0
Long-term Debt, Gross | 351.0 | $ 356.0 |
Line of Credit Facility, Remaining Borrowing Capacity | 350.0 |  |
Line of Credit Capacity, Sublimit for Letters of Credit | $ 60.0 |  |
Capitalization Ratio, Maximum | 50.00% |  |
Debt, weighted average interest rate |  | 4.90% |
Chilean term credit facility, maturing 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 0.0 | $ 5.0 |
Senior unsecured notes, maturing 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of debt | 362.0 | 338.0 |
Amount of loan issuance | 350.0 |  |
Long-term Debt, Gross | $ 350.0 | $ 350.0 |
Debt, interest rate, stated percentage | 4.875% |  |
Base Rate |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 0.50% |  |
Base Rate | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 2.00% |  |
Base Rate | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 0.875% |  |
London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 1.00% |  |
London Interbank Offered Rate (LIBOR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 3.00% |  |
London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 1.875% |  |
Other Commitments [Domain] | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 0.60% |  |
Other Commitments [Domain] | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 0.30% |  |

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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