Financial Statement Information Net Assets Held for Sale (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Impaired Long-Lived Assets Held and Used [Line Items]
Disposition of subsidiary with noncontrolling interests(1)		$ (18,880,000)		$ (18,880,000)
Reedemable NCI, Put Option						$ 24,000,000	€ 21,000,000
Redeemable NCI, Call Option						26,000,000	€ 23,000,000
Redeemable noncontrolling interest	$ 24,077,000		$ 24,077,000			24,077,000
Goodwill	4,473,576,000		4,473,576,000			$ 4,406,535,000
Disposal Group, Including Discontinued Operation, Revenue					$ 78,000,000
Loss on disposal of businesses and impairment of net assets held for sale	$ 503,000	3,601,000	$ (1,733,000)	(44,919,000)
(Gain on disposal of business) and impairment of net assets held for sale		$ 4,000,000		$ 45,000,000