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Debt (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Dec. 31, 2013
Unsecured term credit agreement
Sep. 30, 2013
Unsecured term credit agreement
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Dec. 31, 2012
Unsecured term credit agreement in June 2013
Jun. 30, 2013
Unsecured term credit agreement in June 2013
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Base rate
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Base rate
Maximum
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Base rate
Minimum
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Eurocurrency rate
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Eurocurrency rate
Maximum
Dec. 31, 2013
Unsecured term credit agreement in June 2013
Eurocurrency rate
Minimum
Dec. 31, 2013
Prior term loan facility
Jul. 31, 2010
Unsecured senior notes
Dec. 31, 2013
Unsecured senior notes
Sep. 30, 2013
Unsecured senior notes
Jun. 30, 2013
Unsecured senior notes
Dec. 31, 2013
Unsecured senior notes
Minimum
item
Jul. 31, 2010
5.43% Senior Notes, Series A, due July 2020
Dec. 31, 2013
1.00% Senior Discount Notes, Series B, due July 2022
Sep. 30, 2013
1.00% Senior Discount Notes, Series B, due July 2022
Jul. 31, 2010
1.00% Senior Discount Notes, Series B, due July 2022
Dec. 31, 2013
Unsecured revolving credit facility
Sep. 30, 2013
Unsecured revolving credit facility
Jul. 31, 2011
Unsecured revolving credit facility
Dec. 31, 2013
Unsecured revolving credit facility
Maximum
Dec. 31, 2013
Unsecured revolving credit facility
Minimum
Dec. 31, 2013
Unsecured revolving credit facility
Base rate
Maximum
Dec. 31, 2013
Unsecured revolving credit facility
Base rate
Minimum
Dec. 31, 2013
Unsecured revolving credit facility
Eurocurrency rate
Maximum
Dec. 31, 2013
Unsecured revolving credit facility
Eurocurrency rate
Minimum
Dec. 31, 2013
Other debt
Sep. 30, 2013
Other debt
Dec. 31, 2013
Unsecured credit facilities
Sep. 30, 2013
Unsecured credit facilities
Dec. 31, 2013
Notes secured by real properties
Debt                                                                            
Total debt $ 1,204,100,000   $ 1,173,300,000 $ 750,000,000 $ 750,000,000                       $ 261,100,000 $ 260,200,000             $ 138,200,000 $ 114,700,000               $ 54,800,000 $ 48,400,000      
Less: Current portion of debt and short-term borrowings (90,600,000)   (84,300,000)                                                                      
Long-term debt, less current portion 1,113,452,000   1,089,060,000                                                                      
Scheduled maturities of debt:                                                                            
2014 (nine months remaining) 90,600,000                                                                          
2015 38,300,000                                                                          
2016 176,400,000                                                                          
2017 37,700,000                                                                          
2018 600,000,000                                                                          
Thereafter 261,100,000                                                                          
Total debt 1,204,100,000   1,173,300,000 750,000,000 750,000,000                       261,100,000 260,200,000             138,200,000 114,700,000               54,800,000 48,400,000      
Debt agreements                                                                            
Face amount of debt instrument               750,000,000               300,000,000         175,000,000     125,000,000                            
Additional borrowings available               100,000,000                                                            
Repayment of indebtedness 488,463,000 428,877,000                         675,000,000                                              
Interest rate, basis spread (as a percent)                   1.25% 0.125%   2.25% 1.125%                               1.50% 0.00% 2.50% 1.00%          
Interest rate (as a percent)                                         5.43%     1.00%                           6.04%
Description of interest rate basis                 Base Rate     Eurodollar Rate                                                    
Average interest rate (as a percent)           1.68% 2.02%                                                              
Final principal payment           600,000,000                                                                
Effective interest rate (as a percent)                                           5.62%                                
Fair value of debt instrument                                 276,800,000 269,400,000                                        
Proceeds from sale of senior notes                               249,800,000                                            
Number of subsidiary guarantors                                       1                                    
Maximum borrowing capacity under the credit facility                                                     1,050,000,000                      
Contingent increase to maximum borrowing capacity under the credit facility                                                     1,150,000,000                      
Percentage of commitment fee                                                       0.375% 0.15%                  
Outstanding letters of credit                                                 35,500,000 35,500,000               258,500,000 236,400,000      
Remaining borrowing capacity under the credit facility                                                 876,300,000                     355,600,000    
Outstanding under unsecured credit facilities                                                                       13,700,000 500,000  
Actual consolidated leverage ratio 2.65                                                                          
Maximum consolidated leverage ratio 3.0                                                                          
Net worth threshold, base amount                                     1,200,000,000                                      
Net worth threshold, percentage of the consolidated net income for each fiscal quarter commencing with the specified period                                     40.00%                                      
Actual net worth of the entity 2,036,266,000   2,021,443,000                           2,000,000,000                                          
Net worth threshold                                 1,600,000,000                                          
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) 2.80% 3.00%                                                                        
Total debt                                           $ 86,100,000 $ 85,200,000