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Convertible Senior Notes (Narrative) (Details) - USD ($)		3 Months Ended
	Feb. 16, 2021	Mar. 31, 2021	Feb. 28, 2021
Debt Instrument [Line Items]
Fair value of convertible debt		$ 975,600,000
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of notes			$ 900,000,000
Debt instrument, stated interest rate	1.50%		1.50%
Maturity date		Feb. 15, 2028
Issuance date		Feb. 16, 2021
Shares issued conversion rate per $1,000 principal amount	22.9885
Principal amount for conversion rate	$ 1,000
Conversion price per share	$ 43.50
Debt redemption, percentage of conversion price	150.00%
Debt redemption, trading days	20 days
Debt redemption, consecutive trading days	30 days
Redemption price, percentage	100.00%
Debt issuance costs			$ 4,400,000
Debt instrument, effective interest rate		1.60%
Each Day During the First 180 Days [Member] | Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Additional interest in the event of default	0.25%
181st Day to 360th Day [Member] | Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Additional interest in the event of default	0.50%

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