Asbestos-Related Liabilities - Summary of Outstanding Claims by Year of Exposure and State Filed (Details) - Claim	Sep. 30, 2018	Dec. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding	55,500	55,500
Asbestos After 1964
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding		16,500
Texas | Asbestos Before Or During 1964
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding		13,000
Pennsylvania | Asbestos Before Or During 1964
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding		1,500
Other states that have enacted asbestos legislation | Asbestos Before Or During 1964
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding		6,000
Other states | Asbestos Before Or During 1964
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims outstanding		18,500