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Commitments and Contingencies (Details) - Senior Notes [Member] - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Commitments and Contingencies [Line Items] |  |
Face amount of debt instrument | $ 500,000,000 | $ 500,000,000
Senior Notes Due 2024 [Member] |  |
Commitments and Contingencies [Line Items] |  |
Face amount of debt instrument | $ 250,000,000 | 250,000,000
Debt instrument, interest rate, stated percentage | 4.40% |
Senior Notes Due 2023 [Member] |  |
Commitments and Contingencies [Line Items] |  |
Face amount of debt instrument | $ 250,000,000 | $ 250,000,000
Debt instrument, interest rate, stated percentage | 4.25% |
LCIF [Member] | Senior Notes Due 2024 [Member] |  |
Commitments and Contingencies [Line Items] |  |
Face amount of debt instrument | $ 250,000,000 |
Debt instrument, interest rate, stated percentage | 4.40% |
Debt instrument, redemption price, percentage | 99.883% |
LCIF [Member] | Senior Notes Due 2023 [Member] |  |
Commitments and Contingencies [Line Items] |  |
Face amount of debt instrument | $ 250,000,000 |
Debt instrument, interest rate, stated percentage | 4.25% |
Debt instrument, redemption price, percentage | 99.026% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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