Financial Statement Information Net Assets Held for Sale (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Impaired Long-Lived Assets Held and Used [Line Items]
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	4,377,350,000		4,377,350,000			4,406,535,000
Disposal Group, Including Discontinued Operation, Assets						19,000,000
Disposal Group, Including Discontinued Operation, Liabilities						$ 9,000,000
Disposal Group, Including Discontinued Operation, Revenue					$ 78,000,000
Loss on disposal of businesses and impairment of net assets held for sale	$ 2,485,000	$ 33,497,000	$ 2,236,000	$ 48,520,000