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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Deferred compensation arrangements [Abstract]      
The ratio at which non-option awards granted after the May 2010 amendment are deducted from the shares available for grant 1.85    
The ratio at which non-option awards granted prior to the May 2010 amendment are deducted from the shares available for grant 2.85    
The ratio at which options awards granted are deducted from the shares available for grant one-for-one    
Share-based compensation, allocation and classification in financial statements [Abstract]      
Compensation cost charged to income for the Company's share-based compensation plans $ 3.6 $ 3.5  
Summary of non-option activity [Roll Forward]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 0.5 0.4  
2008 Omnibus Plan [Member]
     
Deferred compensation arrangements [Abstract]      
Aggregate number of Company common shares or Operating Partnership units approved for awards under the 2008 Omnibus Plan, amended (in shares) 8,500,000    
Employee Stock Option [Member]
     
Summary of option activity [Roll Forward]      
Outstanding at January 1, 2014 563,436    
Outstanding at March 31, 2014 563,436   563,436
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 43.81   $ 43.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term, Beginning of Period     2.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term, End of Period 2.4    
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range $ 31.31   $ 31.31
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range $ 55.90   $ 55.90
Fully vested options at March 31, 2014 563,436    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 43.81    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Years) 2.4    
Summary of option activity, additional disclosures [Abstract]      
Aggregate intrinsic value of in-the-money options outstanding 15.2    
Aggregate intrinsic value of in-the-money fully vested options     0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value   3.6  
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options   2.9  
Summary of non-option activity [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price       
Unissued Partnership Units Under Unit Option Deferral Election Member
     
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Options exercised under unit option deferral election plan (in shares) 3,000,000    
The number of mature units tendered for the exercise of previously issued stock options under the unit option deferral election plan (in shares) 2,100,000    
The number of units deferred under the unit option deferral election upon the exercise of previously issued stock options (in shares) 900,000    
Date at which deferred partnership units begin to be issued December 2017    
Number of Annual Installments during which Deferred Partnership Units will be issued ten    
Performance Shares [Member]
     
Summary of non-option activity, additional disclosures [Abstract]      
Awards under the 2008 Omnibus Plan Each PSU represents the right to receive, upon vesting, shares of the Company’s common stock ranging from 0-300% of the PSU based on the Company’s market performance relative to that of a peer group    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.70%    
Weighted average grant-date fair value $ 93.07    
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period three years    
Right to Receive Upon Vesting Shares of Common Stock as Percentage of PSU, Actual Vested During Period 172.00%    
Summary of non-option activity [Roll Forward]      
Granted 49,157    
Granted, weighted average grant date fair value (in dollars per share) $ 93.07    
Total Performance Share Units [Member]
     
Summary of non-option activity, additional disclosures [Abstract]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 20.8    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 6 months 18 days    
Summary of non-option activity [Roll Forward]      
Outstanding at January 1, 2014 234,863    
Vested (in shares) (43,858)    
Outstanding at March 31, 2014 240,162    
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share) $ 139.18    
Vested, weighted average grant date fair value (in dollars per share) $ 85.40    
Outstanding at end of period, weighted average grant date fair value (in dollars per share) $ 139.57    
Restricted Share Units [Member]
     
Summary of non-option activity, additional disclosures [Abstract]      
Awards under the 2008 Omnibus Plan represent the right to receive upon vesting one share of the Company’s common stock    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.70%    
Weighted average grant-date fair value $ 63.95    
Summary of non-option activity [Roll Forward]      
Granted 106,540    
Granted, weighted average grant date fair value (in dollars per share) $ 63.95    
Total Restricted Share Units [Member]
     
Summary of non-option activity, additional disclosures [Abstract]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 12.4    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 1 month 28 days    
Summary of non-option activity [Roll Forward]      
Outstanding at January 1, 2014 269,899    
Vested (in shares) (93,054)    
Outstanding at March 31, 2014 290,883    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 1,007    
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share) $ 62.00    
Vested, weighted average grant date fair value (in dollars per share) $ 50.23    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 59.59    
Outstanding at end of period, weighted average grant date fair value (in dollars per share) $ 66.61    
Additional Restricted Share Units [Member]
     
Summary of non-option activity, additional disclosures [Abstract]      
Awards under the 2008 Omnibus Plan represent the right to receive upon vesting one share of the Company’s common stock    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.13%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 0.71%    
Weighted average grant-date fair value $ 66.19    
Summary of non-option activity [Roll Forward]      
Granted 8,505    
Granted, weighted average grant date fair value (in dollars per share) $ 66.19