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Senior Notes - Summary of Senior Notes (Details) - USD ($) $ in Millions | May 08, 2018 | Jul. 14, 2010
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May 2018 Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.25% |
Maturity date | May 15, 2026 |
Series E |  |
Debt Instrument [Line Items] |  |
Amount |  | $ 60.0
Interest rate |  | 4.72%
Maturity date |  | Jul. 14, 2016
Series F |  |
Debt Instrument [Line Items] |  |
Amount |  | $ 72.0
Interest rate |  | 5.04%
Maturity date |  | Jul. 14, 2017
Series G |  |
Debt Instrument [Line Items] |  |
Amount |  | $ 28.0
Interest rate |  | 5.42%
Maturity date |  | Jul. 14, 2019
Series H |  |
Debt Instrument [Line Items] |  |
Amount |  | $ 85.0
Interest rate |  | 5.59%
Maturity date |  | Jul. 14, 2020

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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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