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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Options exercised     332,032  
Options granted in current year     0  
Total compensation cost for option and share awards $ 3.6 $ 3.2 $ 6.7 $ 6.2
Total capitalized compensation cost for option and share awards 0.4 0.3 0.7 0.6
Options [Member]
        
Options exercised     300,000 300,000
Total intrinsic value of options exercised during the period     7.0 5.0
Total unrecognized compensation cost related to unvested options which is expected to be amortized 0.8   0.8  
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans     2 years  
Remaining weighted average contractual life (years) outstanding options     4 years 255 days  
Remaining weighted average contractual life (years) exercisable options     3 years 328 days  
Options granted in current year     0  
Share Awards and Vesting [Member]
        
Total unrecognized compensation cost related to unvested options which is expected to be amortized 40.9   40.9  
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans     5 years  
Vesting period, years     5 years  
Fair value of shares vested     $ 13.4 $ 11.0
Minimum [Member] | Options [Member]
        
Exercise price range for options exercised during the period     $ 30.06 $ 30.06
Vesting period, years     3 years  
Maximum [Member] | Options [Member]
        
Exercise price range for options exercised during the period     $ 51.37 $ 48.02
Vesting period, years     5 years  
2011 Share Incentive Plan [Member]
        
Total fungible units to be issued 7,900,000 9,100,000 7,900,000 9,100,000
Units available under the 2011 Share Plan   5,800,000   5,800,000
Fungible units transferred from the 2002 Share Plan to the 2011 Share Plan   3,300,000   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   2,300,000