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Debt - Senior Unsecured Notes (Details) - Senior Notes [Member] | Dec. 31, 2017 USD ($)
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Series D, Series E, and Series F Senior Unsecured Notes [Member] |
Line of Credit Facility [Line Items] |
Face amount | $ 450,000,000.0
Series D Senior Notes due 2028 [Member] |
Line of Credit Facility [Line Items] |
Face amount | $ 115,000,000.0
Stated interest rate | 4.08%
Series E Senior Notes due 2030 [Member] |
Line of Credit Facility [Line Items] |
Face amount | $ 160,000,000.0
Stated interest rate | 4.26%
Series F Senior Notes due 2033 [Member] |
Line of Credit Facility [Line Items] |
Face amount | $ 175,000,000.0
Stated interest rate | 4.44%

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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 + Details
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