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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Options [Member]
Sep. 30, 2011
Options [Member]
Sep. 30, 2012
Share Awards and Vesting [Member]
Sep. 30, 2011
Share Awards and Vesting [Member]
Sep. 30, 2012
Minimum [Member]
Options [Member]
Sep. 30, 2011
Minimum [Member]
Options [Member]
Sep. 30, 2012
Maximum [Member]
Options [Member]
Sep. 30, 2011
Maximum [Member]
Options [Member]
Jun. 30, 2011
2011 Share Incentive Plan [Member]
Sep. 30, 2012
2011 Share Incentive Plan [Member]
Total fungible units to be issued                         9,100,000 7,900,000
Units available under the 2011 Share Plan                         5,800,000  
Fungible units transferred from the 2002 Share Plan to the 2011 Share Plan                         3,300,000  
Fungible Units To Full Value Award Conversion Ratio                         3.45  
Expiration value of option right or other award                         0.83  
Common shares which could be granted pursuant to full value awards                           2,300,000
Options exercised     458,881   500,000 500,000                
Exercise price range for options exercised during the period                 $ 30.06 $ 30.06 $ 51.37 $ 62.32    
Total intrinsic value of options exercised during the period         $ 12.0 $ 9.5                
Total unrecognized compensation cost related to unvested options which is expected to be amortized         0.6   36.9              
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans         2 years   5 years              
Remaining weighted average contractual life (years) outstanding options         4 years 73 days                  
Remaining weighted average contractual life (years) exercisable options         3 years 73 days                  
Vesting period, years             5 years   3 years   5 years      
Options granted in current year     0   0                  
Fair value of shares vested             13.4 11.0            
Total compensation cost for option and share awards 3.6 3.3 10.4 9.5                    
Total capitalized compensation cost for option and share awards $ 0.4 $ 0.3 $ 1.1 $ 0.9