Intangible Assets and Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 07, 2019
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 0	$ 0	$ 0
Intangible assets
Contingent consideration impairment	(10,000,000.0)	20,000,000.0	(5,500,000)	8,500,000
Total intangible assets, gross	8,398,200,000		8,398,200,000		$ 8,408,800,000
Accumulated Amortization	(5,014,400,000)		(5,014,400,000)		(4,881,400,000)
Intangible assets, net	3,383,800,000		3,383,800,000		3,527,400,000
Amortization and impairment of acquired intangible assets	61,500,000	$ 70,100,000	133,000,000.0	$ 138,300,000
Expected future amortization expense, 2019 (remaining three months)	126,000,000.0		126,000,000.0
Expected future amortization expense, 2020	220,000,000.0		220,000,000.0
Expected future amortization expense, 2021	220,000,000.0		220,000,000.0
Expected future amortization expense, 2022	230,000,000.0		230,000,000.0
Expected future amortization expense, 2023	230,000,000.0		230,000,000.0
Expected future amortization expense, 2024	220,000,000.0		220,000,000.0
Out-licensed patents
Intangible assets
Cost	7,379,300,000		7,379,300,000		7,379,300,000
Net	2,364,900,000		2,364,900,000		2,497,900,000
Accumulated Amortization	(5,014,400,000)		$ (5,014,400,000)		(4,881,400,000)
Out-licensed patents | Minimum
Intangible assets
Estimated life, (in years)			13 years
Out-licensed patents | Maximum
Intangible assets
Estimated life, (in years)			23 years
Developed technology | Minimum
Intangible assets
Estimated life, (in years)			15 years
Developed technology | Maximum
Intangible assets
Estimated life, (in years)			28 years
Acquired and in-licensed rights and patents | Minimum
Intangible assets
Estimated life, (in years)			4 years
Acquired and in-licensed rights and patents | Maximum
Intangible assets
Estimated life, (in years)			18 years
In Process Research and Development
Intangible assets
Indefinite lived intangible assets useful life			Indefinite until commercialization
Cost and Net	954,900,000		$ 954,900,000		965,500,000
Accumulated Amortization	0		$ 0		0
Trademarks and Trade Names
Intangible assets
Indefinite lived intangible assets useful life			Indefinite
Cost and Net	64,000,000.0		$ 64,000,000.0		64,000,000.0
Accumulated Amortization	0		0		$ 0
Nightstar
Intangible assets
In-process research and development						$ 700,000,000.0
TGN [Member] | In Process Research and Development
Intangible assets
Cost and Net	$ 160,200,000		$ 160,200,000