Employer Sponsored Benefit Plans - Narrative (Details) - United States - Pension plan - USD ($)	1 Months Ended		3 Months Ended			9 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
IPM Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions during remainder of fiscal year			$ 1,200,000			$ 1,200,000
Contributions made by company to domestic pension plan			$ 0		$ 300,000	$ 400,000	$ 1,100,000
Delayed contributions to plan	$ 300,000	$ 300,000
ISS Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax settlement loss				$ 400,000