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Share Capital, Option Plans And Share-Based Payments (Schedule Of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 0.5 $ 6.5 $ 5.9 $ 16.7
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options $ 0 $ 2.9 $ 0.8 $ 3.7
Weighted-average fair value of options granted (in dollars per share) $ 18.08 $ 22.38 $ 17.17 $ 21.20
Expected volatility 36.00% 42.00% 37.00% 42.00%
Risk-free interest rate 0.76% 0.67% 0.67% 0.70%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected life (in years) 4 years 4 months 6 days 4 years 11 months 19 days 4 years 4 months 6 days 4 years 9 months 22 days
Forfeiture rate (based on historical rates) 5.00% 5.00% 5.00% 5.00%