Financial Statement Information Noncontrolling Interest (Details)		3 Months Ended		9 Months Ended
		Dec. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Decrease from Deconsolidation	[1]			$ 11,404,000
Disposition of subsidiary with noncontrolling interests(1)			$ (18,880,000)		$ (18,880,000)
Redeemable noncontrolling interest				24,077,000		$ 24,077,000
Redeemable NCI, Call Option						26,000,000	€ 23,000,000
Proceeds from (Payments to) Noncontrolling Interests		$ 10,000,000	19,000,000
Reedemable NCI, Put Option						$ 24,000,000	€ 21,000,000
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Decrease from Deconsolidation	[1]			$ 11,404,000
Disposition of subsidiary with noncontrolling interests(1)			(10,116,000)		(10,116,000)
Additional Paid-In Capital
Noncontrolling Interest [Line Items]
Disposition of subsidiary with noncontrolling interests(1)			$ (8,764,000)		$ (8,764,000)

[1] (1) The amount disposed of in 2020 relates to discontinued operations. See Note 2, "Discontinued Operations," for further information.