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Borrowings (Details) € in Thousands, $ in Thousands	12 Months Ended
Borrowings (Details) € in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)
Letters of Credit [Abstract]
Letters of credit outstanding	$ 135,400
Maturities of Long-term Debt [Abstract]
2017	350,011
2018	1,943
2019	354,349
2020	448,831
2021	0
2022 and thereafter	2,181,579
Total future maturities	3,336,713
Debt Instrument [Line Items]
Short-term Debt	350,402		$ 6,950
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	14,900		16,500
Short-term borrowings [Abstract]
Commercial paper	230,700		407,600
Total short-term debt	581,102		414,550
Long-term borrowings [Abstract]
Long-term Debt	3,336,713		3,207,777
Long-term Debt, Current Maturities	350,011		1,140
Total long-term debt	2,986,702		3,206,637
Unamortized discount	17,600		18,800
Proceeds from Issuance of Debt	$ 656,399
Line of Credit Facility [Abstract]
Line of credit facility, interest rate description	At the Company's election, loans under the Credit Agreement will bear interest at a base rate plus an applicable margin.
Line of credit facility, covenant terms	the Credit Agreement requires the Company to pay a facility fee and imposes various restrictions on the Company such as, among other things, the requirement for the Company to maintain an interest coverage ratio of consolidated EBITDA to consolidated net interest expense of greater than or equal to 3.0 to 1
Line of credit facility, covenant compliance	11.4 to 1.0
Note due 2018 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 349,918		349,502
Debt instrument, stated interest rate (in hundredths)	5.45%	5.45%
Term of debt instrument (in years)	10 years
Debt instruments, maturity date	Mar. 15, 2018
Face amount of notes	$ 350,000
Note due 2020 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 354,349		311,851
Debt instrument, stated interest rate (in hundredths)	2.125%	2.125%
Term of debt instrument (in years)	7 years
Debt instruments, maturity date	Dec. 01, 2020
Face amount of notes \| €		€ 300,000
Note due 2021 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 448,831		448,458
Debt instrument, stated interest rate (in hundredths)	4.30%	4.30%
Term of debt instrument (in years)	10 years
Debt instruments, maturity date	Mar. 01, 2021
Face amount of notes	$ 450,000
Note due 2025 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 394,695		394,042
Debt instrument, stated interest rate (in hundredths)	3.15%	3.15%
Term of debt instrument (in years)	10 years
Debt instruments, maturity date	Nov. 15, 2025
Face amount of notes	$ 400,000
Note due 2026 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 701,058		616,893
Debt instrument, stated interest rate (in hundredths)	1.25%	1.25%
Term of debt instrument (in years)	10 years
Debt instruments, maturity date	Nov. 09, 2026
Face amount of notes \| €		€ 600,000		€ 600,000
Debentures due 2028 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 198,954		198,830
Debt instrument, stated interest rate (in hundredths)	6.65%	6.65%
Term of debt instrument (in years)	30 years
Debt instruments, maturity date	Jun. 01, 2028
Face amount of notes	$ 200,000
Debenture due 2035 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 295,561		295,316
Debt instrument, stated interest rate (in hundredths)	5.375%	5.375%
Term of debt instrument (in years)	30 years
Debt instruments, maturity date	Oct. 15, 2035
Face amount of notes	$ 300,000
Note due 2038 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 247,713		247,593
Debt instrument, stated interest rate (in hundredths)	6.60%	6.60%
Term of debt instrument (in years)	30 years
Debt instruments, maturity date	Mar. 15, 2038
Face amount of notes	$ 250,000
Note due 2041 [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 343,600		343,323
Debt instrument, stated interest rate (in hundredths)	5.375%	5.375%
Term of debt instrument (in years)	30 years
Debt instruments, maturity date	Mar. 01, 2041
Face amount of notes	$ 350,000
Other long term debt instruments [Member]
Long-term borrowings [Abstract]
Long-term Debt	$ 2,034		1,969
Credit Agreement [Member]
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000,000
Credit facility expiration date	Nov. 10, 2020
Minimum [Member]
Line of Credit Facility [Abstract]
Credit facility expiration date	Dec. 31, 2018
Maximum [Member]
Line of Credit Facility [Abstract]
Credit facility expiration date	Dec. 31, 2039