Investments - Variable Interest Entity (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity
Assets		$ 5,169,100,000	$ 4,615,000,000
Liabilities		1,210,200,000	1,219,800,000
Gain (loss) on consolidation of variable interest entity		0
Impairments of investments in privately-held companies		2,300,000	9,100,000	$ 0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
Assets		10,600,000	11,700,000
Liabilities		2,000,000	$ 24,000,000
Maximum exposure to loss		10,600,000
Variable Interest Entity | Property, Plant and Equipment
Variable Interest Entity
Assets		49,300,000
Privately-held Companies | Variable Interest Entity
Variable Interest Entity
Investment purchased during the period	$ 7,500,000
Impairment charge on research and development				8,800,000
Goodwill on deconsolidation				3,500,000
Temporary equity derecognized				8,400,000
Net loss on deconsolidating				$ 2,000,000
Impairments of investments in privately-held companies		$ 1,300,000