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Debt - 0.75% Senior convertible notes (Details) - Senior Notes	1 Months Ended		9 Months Ended	12 Months Ended
	Nov. 30, 2018 USD ($) d $ / shares shares	Jun. 30, 2017 USD ($) $ / shares	Sep. 30, 2019 USD ($) d	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Senior convertible notes due 2022
Debt Instrument [Line Items]
Interest rate on convertible notes		0.75%
Aggregate principal amount		$ 400,000,000.0	$ 400,000,000.0	$ 400,000,000.0
Proceeds from convertible debt		$ 389,000,000.0
Conversion multiple			$ 1,000
Initial conversion price of convertible notes (in dollars per share) | $ / shares		$ 99.09
Conversion price in event of fundamental change			100.00%
Conversion percentage based on last reported sale price			140.00%
Debt instrument, redemption price, percentage			100.00%
Senior convertible notes due 2023
Debt Instrument [Line Items]
Interest rate on convertible notes	0.75%
Aggregate principal amount	$ 850,000,000.0		$ 850,000,000.0	850,000,000.0
Proceeds from convertible debt	$ 836,600,000
Debt instrument, convertible, conversion ratio	0.0060869	0.0100918
Conversion multiple			$ 1,000
Initial conversion price of convertible notes (in dollars per share) | $ / shares	$ 164.29
Conversion price in event of fundamental change			100.00%
Threshold consecutive trading days | d	60
Conversion percentage based on last reported sale price			130.00%
Debt instrument, redemption price, percentage			100.00%
Warrants sold to counterparties (in shares) | shares	5,200,000
Proceeds from issuance of warrants	$ 183,800,000
Strike price of warrant (in usd per share) | $ / shares	$ 198.38
Additional Paid-In Capital | Senior convertible notes due 2022
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity					$ 72,600,000
Additional Paid-In Capital | Senior convertible notes due 2023
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity				$ 174,400,000
Term of at least 20 trading days during a period of 30 consecutive trading days | Minimum | Senior convertible notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d			20
Threshold percentage of stock price trigger			130.00%
Term of at least 20 trading days during a period of 30 consecutive trading days | Minimum | Senior convertible notes due 2023
Debt Instrument [Line Items]
Threshold consecutive trading days | d			20
Threshold percentage of stock price trigger			130.00%
Term of at least 20 trading days during a period of 30 consecutive trading days | Maximum | Senior convertible notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d			30
Term of at least 20 trading days during a period of 30 consecutive trading days | Maximum | Senior convertible notes due 2023
Debt Instrument [Line Items]
Threshold consecutive trading days | d			30
Term of five business day period after any five consecutive trading day period | Senior convertible notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d			5
Term of five business day period after any five consecutive trading day period | Senior convertible notes due 2023
Debt Instrument [Line Items]
Threshold consecutive trading days | d			5
Term of five business day period after any five consecutive trading day period | Maximum | Senior convertible notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d			5
Threshold percentage of stock price trigger			98.00%
Term of five business day period after any five consecutive trading day period | Maximum | Senior convertible notes due 2023
Debt Instrument [Line Items]
Threshold consecutive trading days | d			5
Threshold percentage of stock price trigger			98.00%
Designated as Hedging Instrument | Senior convertible notes due 2023
Debt Instrument [Line Items]
Convertible note hedge, number of shares | shares	5,200,000
Cost of convertible note hedge recognized in additional paid-in capital	$ 218,900,000

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