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Summary of Significant Accounting Policies - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Aggregate principal amount	$ 3,540,250	$ 3,547,400
Impact of adoption of standard on Accumulated deficit	(9,118,597)	(9,034,790)	$ (1,925,681)		$ (1,248,599)
Acquisition	8,121	4,501,894
Science Segment
Summary of Significant Accounting Policies
Acquisition	0	499,199
Goodwill, Written off Related to Sale of Business Unit		0
Accumulated Deficit
Summary of Significant Accounting Policies
Impact of adoption of standard on Accumulated deficit	1,306,789	1,250,838	$ 1,029,846		$ 890,894
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
Summary of Significant Accounting Policies
Impact of adoption of standard on Accumulated deficit				$ 10,097
Term Loan Facility
Summary of Significant Accounting Policies
Aggregate principal amount	$ 2,840,250	$ 2,847,400

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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