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Debt (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt [Line Items]      
Notes payable and debt   $ 100,273,000 $ 125,297,000
Long-term debt   1,897,501,000 1,701,966,000
Total debt   1,997,774,000 1,827,263,000
Line of Credit Facility [Abstract]      
Foreign subsidiary lines of credit   273,000 297,000
Line of credit maximum borrowing capacity   $ 91,000,000 $ 79,000,000
Line of credit interest rate during the period   1.48% 1.49%
MaturitiesOfLongTermDebtAbstract      
Debt maturities, year 1   $ 100,273,000  
Debt maturities, year 3   100,000,000  
Debt maturities, year 4   150,000,000  
Debt maturities, year 5   1,300,000,000  
Debt maturities after year 5   350,000,000  
Total debt maturities   2,000,273,000  
Long-Term Liabilities      
Debt [Line Items]      
Unamortized debt issuance costs   $ (2,499,000) $ (3,034,000)
Senior unsecured notes - Series B [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   5.00%  
Long-term debt   $ 100,000,000 100,000,000
Senior unsecured notes - Series D [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.22%  
Notes payable and debt   $ 100,000,000  
Long-term debt     100,000,000
Senior unsecured notes - Series E [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.97%  
Long-term debt   $ 50,000,000 50,000,000
Senior unsecured notes - Series F [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.40%  
Long-term debt   $ 100,000,000 100,000,000
Senior unsecured notes - Series G [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.92%  
Long-term debt   $ 50,000,000 50,000,000
Senior unsecured notes - Series H [Member]      
Debt [Line Items]      
Interest rate terms on debt   * Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.  
Long-term debt [1]   $ 50,000,000 50,000,000
Senior unsecured notes - Series I [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.13%  
Long-term debt   $ 50,000,000 50,000,000
Senior unsecured notes - Series J [Member]      
Debt [Line Items]      
Interest rate terms on debt   ** Series J senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.  
Long-term debt [2]   $ 40,000,000 40,000,000
Senior unsecured notes - Series K [Member]      
Debt [Line Items]      
Stated interest rate on debt instrument   3.44%  
Long-term debt   $ 160,000,000 160,000,000
Credit Agreements      
Debt [Line Items]      
Amount of debt paid off $ 1,300,000,000    
Interest rate terms on debt   The interest rates applicable to the 2017 Credit Agreement are, at the Company’s option, equal to either the alternate base rate (which is a rate per annum equal to the greatest of (a) the prime rate in effect on such day, (b) the Federal Reserve Bank of New York Rate on such day plus 1/2 of 1% per annum and (c) the adjusted LIBO rate on such day (or if such day is not a business day, the immediately preceding business day) for a deposit in U.S. dollars with a maturity of one month plus 1% per annum) or the applicable 1, 2, 3 or 6 month adjusted LIBO rate or EURIBO rate for Euro-denominated loans, in each case, plus an interest rate margin based upon the Company’s leverage ratio, which can range between 0 and 12.5 basis points for alternate base rate loans and between 80 and 112.5 basis points for LIBO rate or EURIBO rate loans.  
Debt facility fee   The facility fee on the 2017 Credit Agreement ranges between 7.5 and 25 basis points per annum, based on the leverage ratio, of the amount of the revolving facility commitments and the outstanding term loan.  
Debt covenant description   The 2017 Credit Agreement requires that the Company comply with an interest coverage ratio test of not less than 3.50:1 as of the end of any fiscal quarter for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter. In addition, the 2017 Credit Agreement includes negative covenants, affirmative covenants, representations and warranties and events of default that are customary for investment grade credit facilities.  
Long-term debt   $ 1,300,000,000 1,005,000,000
Unused borrowing capacity   $ 498,000,000 468,000,000
Credit Agreements | Term loan facility [Member]      
Debt [Line Items]      
Face value of debt 300,000,000    
Credit Agreements | Revolving facilities [Member]      
Debt [Line Items]      
Face value of debt $ 1,500,000,000    
Notes payable and debt     125,000,000
Unsecured debt      
Debt [Line Items]      
Call feature on debt instrument   The Company may prepay all or some of the senior unsecured notes at any time in an amount not less than 10% of the aggregate principal amount outstanding, plus the applicable make-whole amount or prepayment premium for Series H and J senior unsecured notes. In the event of a change in control of the Company (as defined in the note purchase agreement), the Company may be required to prepay the senior unsecured notes at a price equal to 100% of the principal amount thereof, plus accrued and unpaid interest.  
Debt covenant description   These senior unsecured notes require that the Company comply with an interest coverage ratio test of not less than 3.50:1 for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter. In addition, these senior unsecured notes include customary negative covenants, affirmative covenants, representations and warranties and events of default.  
Long-term debt   $ 700,000,000 $ 700,000,000
Credit Agreements and Unsecured Debt [Member]      
Debt [Line Items]      
Weighted-average interest rate   2.98% 2.55%
[1]
* Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.
[2]
** Series J senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.