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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statement Of Stockholders Equity [Abstract] |  |  |  |  |  |
Dividends per share on common stock |  |  | $ 0.52 |  | $ 0.52 | $ 0.52
Settlement share transfer and excess tax benefit | $ (46.0) | $ (38.0) | $ 46.2 | [1] |  |
[1] | In 2015, we recorded an out of period adjustment of $46 million related to excess tax benefits from the Settlement agreement. Refer to Note 16, “Income Taxes” of the notes to Consolidated Financial Statements for further details.

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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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