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Shareholders' Equity (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 01, 2016
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Nov. 19, 2013
USD ($)
Class of Stock [Line Items]        
Number of ordinary shares issued for each common share of predecessor entity 1      
Par or nominal value per share | $ / shares $ 0.01 $ 0.01 $ 0.01  
Changes in shares associated with the Redomicile Transaction | shares 52,529,197      
Treasury shares cancelled, shares | shares 7,310,022      
Treasury shares cancelled, value $ 106.5      
Ordinary shares, shares outstanding | shares   45,696,338 45,326,430  
Convertible Senior Notes 1.00 percent due 2020        
Class of Stock [Line Items]        
Debt instrument, fair value of embedded option   $ 71.7   $ 71.7
Purchase of convertible hedges   72.6    
Proceeds from issuance of warrants   40.5    
Deferred financing cost allocated to equity   $ 1.6    
Ordinary Shares        
Class of Stock [Line Items]        
Par or nominal value per share | $ / shares $ 0.01      
Ordinary shares, shares outstanding | shares   45,696,338 45,326,430  
Common Class A        
Class of Stock [Line Items]        
Number of ordinary shares issued for each common share of predecessor entity 1      
Par or nominal value per share | $ / shares $ 0.0001