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Debt (Narrative) (Details)
12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jan. 02, 2011
USD ($)
Dec. 31, 2012
Commercial Paper [Member]
USD ($)
Dec. 31, 2011
Commercial Paper [Member]
Jan. 31, 2009
7.25% Unsecured Notes due February 1, 2019 [Member]
USD ($)
Dec. 31, 2012
7.25% Unsecured Notes due February 1, 2019 [Member]
USD ($)
Dec. 31, 2011
7.25% Unsecured Notes due February 1, 2019 [Member]
USD ($)
Jun. 17, 2011
Five-Year Revolving Credit Agreement Dated, August 8, 2006 [Member]
USD ($)
Jun. 17, 2011
Four-Year Revolving Credit Agreement Dated, June 17, 2011 [Member]
USD ($)
Dec. 31, 2012
Four-Year Revolving Credit Agreement Dated, June 17, 2011 [Member]
Dec. 31, 2012
AUD $50 million portion of Revolver [Member]
USD ($)
Dec. 31, 2011
AUD $50 million portion of Revolver [Member]
USD ($)
Sep. 07, 2011
AUD $50 million portion of Revolver [Member]
AUD
Jun. 17, 2011
AUD $50 million portion of Revolver [Member]
AUD
Dec. 31, 2012
USD $450 million portion of Revolver [Member]
USD ($)
Dec. 20, 2012
USD $450 million portion of Revolver [Member]
USD ($)
Dec. 31, 2011
USD $450 million portion of Revolver [Member]
USD ($)
Jun. 17, 2011
USD $450 million portion of Revolver [Member]
USD ($)
Sep. 07, 2011
Interest Rate Swap [Member]
AUD
Dec. 31, 2012
Other Indebtedness [Member]
Debt Instrument [Line Items]                                          
Borrowings outstanding                 $ 0     $ 51,915,000 $ 51,012,000 50,000,000   $ 240,121,000 $ 240,000,000 $ 0      
Commercial paper borrowings 0 109,671,000   0                                  
Minimum interest rate                                         0.00%
Maximum interest rate                                         6.00%
Interest rate of debt instrument         0.50% 7.25% 7.25% 7.25%                 1.5107%        
Debt Instrument, Maturity year, start                                         2013
Debt Instrument, Maturity year, end                                         2017
Debt Instrument, Maturity date           Feb. 01, 2019       Jun. 17, 2015                      
Face amount of debt issued           400,000,000                              
Notes repurchase percentage of principal amount to be eligible for redemption           101.00%                              
Average borrowings outstanding 483,300,000 426,700,000                                      
Weighted average interest rate of borrowings 6.70% 7.00%                                      
Net interest expense incurred 32,600,000 29,100,000 27,900,000                                    
Fair value of debt instrument             481,424,000 [1] 460,500,000 [1]                          
Termination of credit agreement                 500,000,000                        
Current borrowing capacity                             50,000,000       450,000,000    
Maximum borrowing capacity                   700,000,000                      
Minimum fee percentage for line of credit facility                     0.08%                    
Maximum fee percentage for line of credit facility                     0.20%                    
Line of credit facility minimum requirement of shareholder's equity                   1,500,000,000                      
Carrying value of debt instrument 397,479,000 397,065,000         397,500,000 397,100,000                          
Debt Instrument, Interest Rate Terms                     Any borrowings are made on an unsecured basis and bear interest at (a) for U.S. dollar borrowings, at the Company’s option, either (i) a fluctuating interest rate equal to the highest of JPMorgan’s prime rate, 0.50 percent above the Federal funds rate or the one-month eurodollar rate plus 1%, or (ii) the eurodollar rate for the applicable interest period; or (b) for Australian dollar borrowings, the bank bill rate, in each case plus an applicable margin that depends on the Company’s long-term debt ratings.                    
Types Of Interest Rate Derivatives Used                                       interest rate swap  
Notional Amount of Cash Flow Hedge Instruments                                       50,000,000  
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge                                       March 7, 2015  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate                                       4.5275%  
[1] See Note 10 for carrying amount of these notes and borrowing.