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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.