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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (PARENTHETICAL) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |
Dividends declared (in dollars per share) | $ 0.37 | $ 0.40 | $ 1.11 | $ 1.20
Underwriters' discount |  |  | $ 0.0 | $ 1.9
Third Party Agent Commissions and Fees |  |  | $ 0.0 | $ 0.2

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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