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Summary of Significant Accounting Policies - Other Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Aggregate principal amount	$ 5,368,526	$ 3,547,400
Impact of adoption of standard on Accumulated deficit	(11,210,340)	(9,280,723)	$ (11,490,079)	$ (9,396,772)	$ (2,022,313)	$ (2,191,354)	$ (1,925,681)		$ (1,248,599)
Acquisition	31,926	4,700,138
Science Segment
Summary of Significant Accounting Policies
Acquisition	11,297	497,263
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	1,317,365		$ 1,318,246	$ 1,236,036	$ 1,237,113	$ 1,055,127	$ 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	$ 2,825,950	$ 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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