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Significant Accounting Policies Shares Related To Convertible Senior Notes (Details) - Senior Notes - USD ($)	1 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Conversion price		$ 26.95
Principal amount		$ 345,000,000
Face amount		$ 345,000,000	$ 345,000,000		$ 345,000,000
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Conversion price	$ 51.56
Principal amount	$ 800,000,000
Face amount			$ 800,000,000	$ 700,000,000
Capped Call | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Conversion price		$ 40.68
Capped Call | 0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Conversion price	$ 79.32

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The price per share of the conversion feature embedded in the debt instrument.

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