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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 23, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2018 | Jan. 16, 2018
Subsequent event |  |  |  |  |  |
Dividend declared (in dollars per share) |  | $ 0.24 | $ 0.24 | $ 0.24 |  |
6.15% senior notes due February 2018 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |
Interest rate (as a percent) |  | 6.15% |  |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent event |  |  |  |  |  |
Dividend declared (in dollars per share) | $ 0.06 |  |  |  |  |
Subsequent Event | 5.75% senior unsecured notes due February 1, 2025 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 800
Interest rate (as a percent) |  |  |  |  |  | 5.75%
Subsequent Event | 6.15% senior notes due February 2018 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.15% |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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 + Details
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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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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