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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2011
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Options exercised during the period       109,936  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 13,000     12,854  
Total compensation cost for option and share awards | $ $ 5.2 $ 4.8   $ 10.9 $ 8.9
Total capitalized compensation cost for option and share awards | $ 1.0 $ 0.9   1.9 $ 1.7
Employee Stock Option [Member]          
Allocated Share-based Compensation Expense | $       $ 0.1  
Options exercised during the period       100,000 100,000
Total intrinsic value of options exercised during the period | $       $ 4.7 $ 2.0
Remaining weighted average contractual life (years) outstanding options       2 years 8 months 12 days  
Remaining weighted average contractual life (years) exercisable options       2 years 8 months 12 days  
Share Awards and Vesting [Member]          
Total unrecognized compensation cost which is expected to be amortized | $ $ 37.7     $ 37.7  
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans       3 years  
Fair value of shares vested | $       $ 22.5 $ 18.1
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%  
Minimum [Member] | Share Awards and Vesting [Member]          
Vesting period, years       3 years  
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.33%  
Maximum [Member] | Share Awards and Vesting [Member]          
Vesting period, years       5 years  
2011 Share Incentive Plan [Member]          
Total fungible units available 3,700,000   9,100,000 3,700,000  
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    
Full Value award in the fungible unit conversion ratio     1.0    
Value of option right or other award in the fungible unit conversion     0.83    
Common shares which could be granted pursuant to full value awards 1,100,000     1,100,000