Restructuring Charges and Asset Impairment Charges - Narrative (Details)	3 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) facility	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges	$ 130,100,000	$ 2,300,000	$ 68,500,000	$ 0	$ 0
Impairment of intangible assets			7,300,000
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges			20,700,000
Impairment of intangible assets			$ 7,300,000
Number of power production facilities closed | facility			2
Fixed Cost Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 8,400,000
Number of positions eliminated, period percent			20.00%
Payments for restructuring			$ 3,500,000
Stock-based compensation income, forfeitures, noncash			900,000
Enterprise Resource System
Restructuring Cost and Reserve [Line Items]
Restructuring charges			8,300,000
Performance Engineered Products | Business Exit, Oil And Gas
Restructuring Cost and Reserve [Line Items]
Restructuring charges			31,100,000
Tangible asset impairment charges			26,800,000
Impairment of intangible assets			5,600,000
Business exit costs and personnel costs			4,300,000
Property, Plant and Equipment | Facility Closing
Restructuring Cost and Reserve [Line Items]
Tangible asset impairment charges			31,400,000
Property, Plant and Equipment | Performance Engineered Products | Business Exit, Oil And Gas
Restructuring Cost and Reserve [Line Items]
Tangible asset impairment charges			$ 21,200,000