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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Oct. 01, 2016
Dec. 31, 2015
Class of Stock [Line Items]            
Gain (Loss) on Extinguishment of Debt     $ 279.0 $ (33.5)    
Stock Issued During Period, Shares, New Issues   65,550,000        
Shares Issued, Price Per Share   $ 9.25        
Proceeds from (Repurchase of) Equity   $ 585.5        
Increase in Common Stock, value due to Equity Issuance   6.6        
Increase in Additional Paid in Capital due to Equity Issuance   $ 578.9        
Scenario, Forecast [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues 1,822,432          
Five Point Seven Five Percent Senior Notes [Member]            
Class of Stock [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage     5.75%     5.75%
Debt Instrument, Face Amount     $ 1,025.0      
Five Point Seven Five Percent Senior Notes [Member] | Scenario, Forecast [Member]            
Class of Stock [Line Items]            
Debt Instrument, Repurchased Face Amount         $ 24.5  
Gain (Loss) on Extinguishment of Debt $ 9.0          
Debt Instrument, Face Amount $ 1,000.0