Assets And Liabilities Held For Sale - Schedule of Assets and Liabilities Held For Sale (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Current assets:
Impairment of held for sale assets	$ (8,700,000)	$ (8,700,000)
Total assets held for sale	258,100,000	258,100,000
Current liabilities:
Total liabilities held for sale	79,900,000	79,900,000
MAKS [Member]
Current assets:
Cash and cash equivalents	8,000,000.0	8,000,000.0
Accounts receivable, net	20,500,000	20,500,000
Other current assets	6,100,000	6,100,000
Total current assets	34,600,000	34,600,000
Property and equipment, net	12,200,000	12,200,000
Goodwill	167,400,000	167,400,000
Intangible Assets	44,100,000	44,100,000
Deferred Tax Assets	5,700,000	5,700,000
Other assets	2,800,000	2,800,000
Total assets held for sale prior to impairment	266,800,000	266,800,000
Impairment of held for sale assets		(8,700,000)
Total assets held for sale	258,100,000	258,100,000
Current liabilities:
Accounts payable and accrued liabilities	16,000,000.0	16,000,000.0
Deferred revenue	2,700,000	2,700,000
Total current liabilities	18,700,000	18,700,000
Deferred tax liabilities, net	7,400,000	7,400,000
Uncertain Tax Positions	29,300,000	29,300,000
Other liabilities	24,500,000	24,500,000
Total liabilities held for sale	$ 79,900,000	$ 79,900,000