XML 63 R68.htm IDEA: XBRL DOCUMENT v2.4.0.8
Share capital - Authorized and issued (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Aug. 20, 2013
IPO
Equity [Abstract]        
Authorized share capital $ 33.0      
Common share, shares authorized (in shares) 300,000,000 300,000,000    
Common share, par value (in dollars per share) $ 0.10 $ 0.10    
Preference shares, shares authorized (in shares) 30,000,000 30,000,000    
Preference shares, par value (in dollars per share) $ 0.10 $ 0.10    
Common share, shares issued (in shares) 104,031,456 103,888,916    
Common share, shares outstanding (in shares) 104,031,456 103,888,916    
Preference shares, shares issued (in shares) 0 0    
Class of Stock [Line Items]        
Issuance of common shares (in shares)       24,832,484
Sale of stock, price per share (in dollars per share) $ 15.05   $ 10.89 $ 12.50
Sale of stock, net proceeds       $ 286.0