Pension, Post-Retirement and Post-Employment Plans - Expected Future Benefit Payments (Details)	Dec. 31, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans
2020	$ 14,500,000
2021	14,400,000
2022	15,100,000
2023	15,100,000
2024	15,100,000
Subsequent five years	75,300,000
Total	149,500,000
Company's expected future contribution to the plan	0
Pension Plan and SERP | Domestic
Defined Benefit Plans and Other Postretirement Benefit Plans
2020	12,600,000
2021	12,400,000
2022	13,200,000
2023	13,000,000.0
2024	12,700,000
Subsequent five years	65,200,000
Total	129,100,000
Pension Plan and SERP | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans
2020	1,300,000
2021	1,400,000
2022	1,300,000
2023	1,500,000
2024	1,800,000
Subsequent five years	7,300,000
Total	14,600,000
Post-retirement Medical Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
2020	600,000
2021	600,000
2022	600,000
2023	600,000
2024	600,000
Subsequent five years	2,800,000
Total	$ 5,800,000