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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended
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Jan. 13, 2017 | Dec. 13, 2016 | Apr. 15, 2015 | Feb. 26, 2015 | Dec. 09, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Common stock dividends paid |  |  |  |  |  | $ 216.1 | $ 200.8 | $ 157.4
Dividends declared per common share (US$ per share) |  | $ 0.63 |  |  |  | $ 2.36 | $ 2.2 | $ 1.6
Common Stock, Dividends, Per Share, Cash Paid |  |  | $ 0.63 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Common stock dividends paid | $ 59.4 |  |  |  |  |  |  |
Annual Dividend [Member] |  |  |  |  |  |  |  |
Dividends declared per common share (US$ per share) |  |  |  | $ 2.52 | $ 2.20 |  |  |

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- Definition Aggregate dividends paid 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 cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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