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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 9 Months Ended 3 Months Ended 9 Months Ended
Nov. 23, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2012
Mar. 31, 2013
Stock Options [Member]
Sep. 30, 2011
Stock Options [Member]
Mar. 31, 2013
Employee Share Purchase Plan [Member]
Mar. 31, 2012
Employee Share Purchase Plan [Member]
Mar. 31, 2013
Employee Share Purchase Plan [Member]
Mar. 31, 2012
Employee Share Purchase Plan [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)   2,188,491   2,188,491   2,147,151 2,188,491          
Common shares available for issuance (in shares)             2,691,000          
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   $ 17.8   $ 17.8                
Unvested stock awards compensation cost, weighted average recognition period   3 years 3 months 26 days                    
Cash proceeds from exercise of options granted   0.5 6.5 5.9 16.7              
Tax benefit realized from exercise of options   0 2.9 0.8 3.7              
Stock Issued During Period, Value, Treasury Stock Reissued       8.3                
Cash received from employee stock purchase plan                 $ 0.6 $ 0.6 $ 1.6 $ 1.6