Borrowings (Details) € in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Letters of Credit [Abstract]
Letters of credit outstanding					$ 158,500,000
Maturities of Long-term Debt [Abstract]
2017					0
2018					0
2019					0
2020					0
2021					0
2022 and thereafter					2,985,716,000
Total future maturities					2,985,716,000
Debt Instrument [Line Items]
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net		$ 13,000,000.0			16,200,000
Short-term borrowings [Abstract]
Commercial paper		220,318,000			84,700,000
Total short-term debt		220,318,000			84,700,000
Long-term borrowings [Abstract]
Long-term Debt		2,943,660,000			2,985,716,000
Long-term Debt, Current Maturities		0			0
Total long-term debt		2,943,660,000			2,985,716,000
Unamortized discount		15,800,000			18,900,000
Line of Credit Facility [Abstract]
Line of credit facility, interest rate description	may elect to have loans under the Credit Agreement bear interest at a rate based on a benchmark interbank offered rate specified for each currency and, in the case of US Dollars, an alternate base rate (as defined in the Credit Agreement) based on a prime rate plus a specified margin ranging from 0.805% to 1.20%, set on the basis of the credit rating accorded to the Company’s senior unsecured debt by S&P and Moody’s.
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, a requirement to maintain a minimum interest coverage ratio of EBITDA to consolidated net interest expense of not less than 3.0 to 1.
Line of credit facility, covenant compliance	10.6 to 1
Gain (Loss) on Extinguishment of Debt	$ 23,543,000	0	$ 0
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,000,000,000
Note due 2018 [Member]
Long-term borrowings [Abstract]
Debt instrument, stated interest rate (in hundredths)				5.45%	5.45%
Debt Instrument, Term	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		339,657,000			$ 0
Debt instrument, stated interest rate (in hundredths)				2.125%	2.125%
Debt Instrument, Term	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		449,200,000			$ 0
Debt instrument, stated interest rate (in hundredths)				4.30%	4.30%
Debt Instrument, Term	10 years
Debt instruments, maturity date	Mar. 01, 2021
Face amount of notes					$ 450,000,000
Note due 2025 [Member]
Long-term borrowings [Abstract]
Long-term Debt		395,368,000			$ 396,042,000
Debt instrument, stated interest rate (in hundredths)				3.15%	3.15%
Debt Instrument, Term	10 years
Debt instruments, maturity date	Nov. 15, 2025
Face amount of notes					$ 400,000,000
Note due 2026 [Member]
Long-term borrowings [Abstract]
Long-term Debt		672,103,000			$ 658,089,000
Debt instrument, stated interest rate (in hundredths)				1.25%	1.25%
Debt Instrument, Term	10 years
Debt instruments, maturity date	Nov. 09, 2026
Face amount of notes | €				€ 600,000
Debentures due 2028 [Member]
Long-term borrowings [Abstract]
Long-term Debt		199,054,000			$ 199,155,000
Debt instrument, stated interest rate (in hundredths)				6.65%	6.65%
Debt Instrument, Term	30 years
Debt instruments, maturity date	Jun. 01, 2028
Face amount of notes					$ 200,000,000
Debenture due 2035 [Member]
Long-term borrowings [Abstract]
Long-term Debt		295,811,000			$ 296,060,000
Debt instrument, stated interest rate (in hundredths)				5.375%	5.375%
Debt Instrument, Term	30 years
Debt instruments, maturity date	Oct. 15, 2035
Face amount of notes					$ 300,000,000
Note due 2038 [Member]
Long-term borrowings [Abstract]
Long-term Debt		247,827,000			$ 247,939,000
Debt instrument, stated interest rate (in hundredths)				6.60%	6.60%
Debt Instrument, Term	30 years
Debt instruments, maturity date	Mar. 15, 2038
Face amount of notes					$ 250,000,000
Note due 2041 [Member]
Long-term borrowings [Abstract]
Long-term Debt		343,877,000			$ 344,153,000
Debt instrument, stated interest rate (in hundredths)				5.375%	5.375%
Debt Instrument, Term	30 years
Debt instruments, maturity date	Mar. 01, 2041
Face amount of notes					$ 350,000,000
Other long term debt instruments [Member]
Long-term borrowings [Abstract]
Long-term Debt		763,000			0
Note due 2027 [Member]
Long-term borrowings [Abstract]
Long-term Debt		0			$ 548,008,000
Debt instrument, stated interest rate (in hundredths)				0.75%	0.75%
Debt Instrument, Term	8 years
Debt instruments, maturity date	Nov. 04, 2027
Face amount of notes | €				€ 500,000
Line of Credit Facility [Abstract]
Proceeds from Issuance of Debt	$ 494,685
Debentures due 2029 [Member]
Long-term borrowings [Abstract]
Long-term Debt		$ 0			$ 296,270,000
Face amount of notes					$ 300,000,000
Line of Credit Facility [Abstract]
Proceeds from Issuance of Debt	$ 296,937