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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement Of Stockholders Equity [Abstract]          
Dividends per share on common stock     $ 0.61 $ 0.52 $ 0.52
Settlement share transfer and excess tax benefit $ (46.2) $ (37.7) $ (2.9) $ 46.2 [1] $ 37.7
[1] In 2015, we recorded an out-of-period adjustment of $46.2 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.