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Financing Agreements - Redemption Price Expressed as Percentage of Principal Amount (Details) | Dec. 31, 2017
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Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period One [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 103.00%
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period Two [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 102.00%
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period Three [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 101.00%
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period Four [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period Five [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period One [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 102.75%
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period Two [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 101.833%
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period Three [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.917%
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period Four [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period Five [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period One [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 105.75%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Two [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Three [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 104.313%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Four [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 102.875%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Five [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 101.438%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Six [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Seven [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 106.50%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Two [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Three [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 103.25%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Four [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 102.167%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Five [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 101.083%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Six [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Seven [Member] |
Debt Instrument [Line Items] |
Debt redemption price | 100.00%

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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 + Details
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