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LONG-TERM DEBT - 4 1/8% Senior Notes (Details)				12 Months Ended
	Feb. 26, 2020 USD ($)	Nov. 12, 2019 USD ($)	Aug. 01, 2019	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 13, 2017 USD ($)	Feb. 13, 2017 EUR (€)
Proceeds from issuance of long-term debt				$ 1,639,661,000	$ 400,000,000	$ 0
4⅛% Senior Notes
Debt instrument, face amount	$ 200,000,000.0
Redemption price percent if change in control occurs in addition to accrued and unpaid interest		101.00%
Validity tender offer percentage		90.00%
3¼% Senior Notes
Redemption price percent if change in control occurs in addition to accrued and unpaid interest							101.00%	101.00%
4¾% Senior Notes
Redemption price percent if change in control occurs in addition to accrued and unpaid interest							101.00%	101.00%
Senior Notes | 4⅛% Senior Notes
Stated interest rate				4.125%
Debt instrument, face amount	$ 200,000,000.0	$ 400,000,000.0
Debt instrument offering price percentage at principal amount		100.00%
Debt instrument offering price percentage	99.50%
Proceeds from issuance of long-term debt	$ 196,500,000	$ 394,700,000
Senior Notes | 3¼% Senior Notes
Stated interest rate				3.25%
Debt instrument, face amount | €								€ 650,000,000.0
Debt instrument offering price percentage at principal amount							100.00%	100.00%
Senior Notes | 4¾% Senior Notes
Stated interest rate				4.75%
Debt instrument, face amount							$ 300,000,000.0
Debt instrument offering price percentage at principal amount							100.00%	100.00%
Senior Notes | 5½% Senior Notes
Stated interest rate				5.50%
Debt Instrument, redemption price, percentage plus a make-whole premium			100.00%
Debt Instrument, Redemption Period - Post October 1 2022 | 4⅛% Senior Notes
Debt instrument, redemption price, percentage, initial plus accrued and unpaid interest		102.063%
Debt Instrument, Redemption Period - Post October 1 2024 | 4⅛% Senior Notes
Debt instrument, redemption price, percentage, ending, plus accrued and unpaid interest		100.00%
Debt Instrument, Redemption - Pre October 1 2022 | 4⅛% Senior Notes
Debt Instrument, redemption price, percentage plus a make-whole premium		100.00%
Maximum redemption percent allowed and limited to proceeds from equity offering		35.00%
Debt redemption, price percent of principal amount, from the proceeds of certain equity offerings		104.125%

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