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Shareholders' Equity - Dividends and Stock Repurchase Programs (Details) - USD ($)
$ / shares in Units, $ in Millions
 5 Months Ended 6 Months Ended 12 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
May. 31, 2014
Oct. 31, 2008
Dividends                
Cash dividends declared (in dollars per share)     $ 0.24 $ 0.15 $ 0.15      
Stock Repurchase Programs                
Authorized common stock repurchase amount           $ 100.0 $ 65.0 $ 50.0
Shares repurchased 584,000 1,000,000   227,000 926,000      
Amount of shares repurchased $ 30.0 $ 40.5 $ 70.5 $ 10.0 $ 35.0      
Amount available to repurchase shares under stock repurchase program   $ 59.5 $ 59.5