Commitments and Contingencies (Details) - Senior Notes [Member] - USD ($)	3 Months Ended
Mar. 31, 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%

Commitments and Contingencies [Line Items]

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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://www.xbrl.org/2003/role/presentationRef
-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

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