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Subsequent Events (Details) - Subsequent Event
$ / shares in Units, shares in Millions, $ in Millions
May. 04, 2016
USD ($)
$ / shares
May. 04, 2016
USD ($)
$ / shares
shares
Apr. 28, 2016
$ / shares
Apr. 27, 2016
Apr. 26, 2016
Subsequent Event [Line Items]          
Debt instrument, covenant, leverage ratio, maximum         3.25
Fourth Amendment April 2016          
Subsequent Event [Line Items]          
Debt instrument, covenant, leverage ratio, maximum       3.75  
Debt instrument, covenant, senior secured leverage ratio, maximum       3.25  
Convertible Debt | 3.25% Convertible Notes Due 2021          
Subsequent Event [Line Items]          
Debt aggregate principal amount $ 150.0 $ 150.0      
Debt instrument, interest rate, stated percentage 3.25% 3.25%      
Proceeds from debt, net of issuance costs   $ 140.0      
Debt instrument, additional capacity available, term   30 days      
Debt instrument, additional capacity available, amount $ 22.5 $ 22.5      
Convertible Note Hedge Transaction Share Coverage | shares   8.1      
Debt instrument, convertible, conversion price (usd per share) | $ / shares $ 21.105 $ 21.105 $ 13.400    
Convertible Debt Sales Price Premium 0.00%        
Debt Instrument, Convertible, Conversion Ratio     0.0542741