Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Amortization expense	$ 24,800,000	$ 25,900,000	$ 8,700,000
Goodwill	1,432,787,000	1,432,787,000	$ 1,386,853,000	$ 191,371,000
Non-Strategic
Goodwill [Line Items]
Gross goodwill	200,000,000.0
Accumulated impairments	114,100,000
Accumulated divestiture related write-offs	85,900,000
Goodwill	$ 0	$ 0