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Debt and Credit Agreements - Schedule of Senior Unsecured Notes Issued (Details) - Senior Notes - USD ($) | 1 Months Ended
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Sep. 30, 2014 | Dec. 31, 2010 | Jul. 31, 2008
6.51% weighted-average senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  |  | $ 425,000,000.0
6.51% weighted-average senior notes | Tranche 1 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  |  | $ 245,000,000
Term |  |  | 10 years
Coupon |  |  | 6.44%
6.51% weighted-average senior notes | Tranche 2 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  |  | $ 100,000,000
Term |  |  | 12 years
Coupon |  |  | 6.54%
6.51% weighted-average senior notes | Tranche 3 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  |  | $ 80,000,000
Term |  |  | 15 years
Coupon |  |  | 6.69%
5.58% weighted-average senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  | $ 175,000,000.0 |
5.58% weighted-average senior notes | Tranche 1 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  | $ 88,000,000 |
Term |  | 10 years |
Coupon |  | 5.42% |
5.58% weighted-average senior notes | Tranche 2 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  | $ 25,000,000 |
Term |  | 12 years |
Coupon |  | 5.59% |
5.58% weighted-average senior notes | Tranche 3 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  | $ 62,000,000 |
Term |  | 15 years |
Coupon |  | 5.80% |
3.65% weighted-average senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 925,000,000.0 |  |
3.65% weighted-average senior notes | Tranche 1 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 100,000,000 |  |
Term | 7 years |  |
Coupon | 3.24% |  |
3.65% weighted-average senior notes | Tranche 2 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 575,000,000 |  |
Term | 10 years |  |
Coupon | 3.67% |  |
3.65% weighted-average senior notes | Tranche 3 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 250,000,000 |  |
Term | 12 years |  |
Coupon | 3.77% |  |

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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=119993939&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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