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Debt (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
Unsecured term credit agreement
Sep. 30, 2012
Unsecured term credit agreement
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Dec. 31, 2011
Unsecured term credit agreement in September, 2011
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Base rate
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Base rate
Maximum
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Base rate
Minimum
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Eurocurrency rate
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Eurocurrency rate
Maximum
Dec. 31, 2012
Unsecured term credit agreement in September, 2011
Eurocurrency rate
Minimum
Dec. 31, 2012
Prior term loan facility
Jul. 31, 2010
Unsecured senior notes
Dec. 31, 2012
Unsecured senior notes
Sep. 30, 2012
Unsecured senior notes
Dec. 31, 2012
Unsecured senior notes
Minimum
item
Jul. 31, 2010
5.43% Senior Notes, Series A, due July 2020
Dec. 31, 2012
1.00% Senior Discount Notes, Series B, due July 2022
Sep. 30, 2012
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, 2012
Unsecured revolving credit facility
Dec. 31, 2011
Unsecured revolving credit facility
Sep. 30, 2012
Unsecured revolving credit facility
Jul. 31, 2011
Unsecured revolving credit facility
Dec. 31, 2012
Unsecured revolving credit facility
Maximum
Dec. 31, 2012
Unsecured revolving credit facility
Minimum
Dec. 31, 2012
Unsecured revolving credit facility
Base rate
Maximum
Dec. 31, 2012
Unsecured revolving credit facility
Base rate
Minimum
Dec. 31, 2012
Unsecured revolving credit facility
Eurocurrency rate
Maximum
Dec. 31, 2012
Unsecured revolving credit facility
Eurocurrency rate
Minimum
Dec. 31, 2012
Notes secured by real properties
Sep. 30, 2012
Notes secured by real properties
Dec. 31, 2012
Other debt
Sep. 30, 2012
Other debt
Dec. 31, 2012
Unsecured credit facilities
Sep. 30, 2012
Unsecured credit facilities
Debt                                                                          
Total debt $ 1,233,200,000 $ 1,069,700,000 $ 750,000,000 $ 750,000,000                     $ 257,600,000 $ 256,800,000           $ 159,600,000   $ 24,000,000               $ 24,000,000 $ 24,200,000 $ 42,000,000 $ 14,700,000    
Less: Current portion of debt and short-term borrowings (211,400,000) (162,600,000)                                                                      
Long-term debt, less current portion 1,021,772,000 907,141,000                                                                      
Scheduled maturities of debt:                                                                          
2013 (nine months remaining) 173,900,000                                                                        
2014 167,900,000                                                                        
2015 151,700,000                                                                        
2016 461,300,000                                                                        
2017 1,600,000                                                                        
Thereafter 276,800,000                                                                        
Total debt 1,233,200,000 1,069,700,000 750,000,000 750,000,000                     257,600,000 256,800,000           159,600,000   24,000,000               24,000,000 24,200,000 42,000,000 14,700,000    
Total debt                                     82,600,000 81,800,000                                  
Debt agreements                                                                          
Face amount of debt instrument         750,000,000                 300,000,000       175,000,000     125,000,000                                
Additional borrowings available at the entity's request         100,000,000                                                                
Repayment of indebtedness                         600,000,000                                                
Repayment of indebtedness under credit facility                                           147,000,000                              
Interest rate, basis spread (as a percent)               1.50% 0.375%   2.50% 1.375%                               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)         2.02% 2.12%                                                              
Effective interest rate (as a percent)                                     5.62%                                    
Fair value of debt instrument                             276,000,000 277,800,000                                          
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                     254,000,000  
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                                           35,100,000   35,100,000                   202,000,000 209,800,000 4,600,000 4,800,000
Remaining borrowing capacity under the credit facility                                           855,300,000                              
Actual consolidated leverage ratio 2.56                                                                        
Maximum consolidated leverage ratio 3.0                                                                        
Minimum net worth threshold, base amount                             1,200,000,000                                            
Minimum 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 2,049,468,000 2,169,464,000                         2,000,000,000                                            
Minimum net worth threshold                             $ 1,500,000,000                                            
Average effective interest rate on total borrowings, including the effects of swaps (as a percent)                                           3.00% 3.10%