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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Nov. 23, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2012
Dec. 31, 2012
Stock Options [Member]
Sep. 30, 2011
Stock Options [Member]
Dec. 31, 2012
Employee Share Purchase Plan [Member]
Dec. 31, 2011
Employee Share Purchase Plan [Member]
Dec. 31, 2012
Employee Share Purchase Plan [Member]
Dec. 31, 2011
Employee Share Purchase Plan [Member]
Sep. 30, 2007
LTIP [Member]
Jun. 30, 2011
Fiscal 2013 LTIP [Member]
Jun. 30, 2011
Fiscal 2013 LTIP [Member]
Maximum [Member]
Jun. 30, 2011
Fiscal 2013 LTIP [Member]
Minimum [Member]
Dec. 31, 2012
Fiscal 2014 LTIP [Member]
Maximum [Member]
Dec. 31, 2012
Fiscal 2014 LTIP [Member]
Minimum [Member]
Dec. 31, 2012
Fiscal 2015 LTIP [Member]
Maximum [Member]
Dec. 31, 2012
Fiscal 2015 LTIP [Member]
Minimum [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]                                        
Number of shares issued from treasury stock (in shares) 182,616   0   0                              
Number of options outstanding (in shares)   2,088,946   2,088,946   2,147,151 2,088,946                          
Common shares available for issuance (in shares)             2,806,000                          
Vesting period             4 years 4 years                        
Expire period of options, minimum term             7 years 7 years                        
Expire period of options, maximum term             10 years 10 years                        
Unrecognized compensation cost relating to unvested stock awards   $ 17.5   $ 17.5                                
Unvested stock awards compensation cost, weighted average recognition period   3 years 6 months                                    
Cash proceeds from exercise of options granted   2.0 3.0 5.4 10.2                              
Tax benefit realized from exercise of options   0 0.4 0.8 0.8                              
Plan term (in years)                         3 years              
Average stock price of common stock, average period                         30 days              
Stock Issued During Period, Value, Treasury Stock Reissued       8.3                                
LTIP equity plans, estimated award grant percentage against target                           100.00% 150.00% 50.00% 150.00% 0.00% 150.00% 0.00%
Cash received from employee stock purchase plan                 $ 0.4 $ 0.4 $ 1.0 $ 1.0