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Stockholders' Equity - Stock Repurchases (Details) - 2015 Share Repurchase Program - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Oct. 31, 2015
Stockholders' Equity      
Authorized aggregate repurchases of common stock     $ 500.0
Repurchased shares of common stock 1.1 3.3  
Cost of shares repurchased $ 135.8 $ 395.5