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Shareholders' Equity - Stock Repurchase (Details) - October 2015 Stock Repurchase Program [Member] - USD ($)
shares in Millions
 3 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Oct. 31, 2015
Subsequent Event [Line Items]        
Stock Repurchase Program, Authorized Amount       $ 500,000,000
Treasury Stock, Shares, Acquired 0.6 2.8    
Treasury Stock, Value, Acquired, Cost Method $ 50,000,000 $ 200,000,000 $ 200,000,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 50,000,000