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Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
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Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |  |
Quarterly cash dividend (in dollars per share) | $ 0.16 | $ 0.16 | $ 0.16
Amount of quarterly cash dividend declared | $ 26.5 |  |

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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 Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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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- References No definition available. + Details
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