Commitments and Contingencies (Asbestos Liability) (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($) claim	Mar. 31, 2019 USD ($) claim	Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Apr. 22, 2016 USD ($)	Jul. 02, 2015 USD ($)	Sep. 17, 2013 USD ($)	Feb. 25, 2013	Feb. 23, 2011 USD ($)	Mar. 23, 2010 USD ($)
Loss Contingencies [Line Items]
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 11,700,000		$ 9,700,000
Current portion of total estimated liability	$ 65,000,000.0	$ 65,000,000.0		$ 65,000,000.0
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | claim	29,162	29,056	28,498	29,056	29,089
Court Judgment	$ 12,600,000		$ 26,500,000
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 11,700,000		9,700,000	$ 41,500,000
Cumulative claims resolved | claim	139,000
Settlement cost	$ 650,000,000
Average settlement cost per resolved claim				15,800	$ 11,300	$ 7,800
Estimated payments to current and future claimants	36,000,000,000
Additional liability		$ 255,000,000
Liability for claims	696,000,000	$ 712,000,000		$ 712,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Defense Costs For Future Claims		85.00%		85.00%
Current portion of total estimated liability		$ 65,000,000		$ 65,000,000
Aggregate value of policy buyout agreements	82,500,000
Estimated Percentage Of Insurance Which Covers Asbestos Costs		14.00%		14.00%
Insurance reimbursement asset	94,000,000	$ 98,000,000		$ 98,000,000
Gross Settlement And Defense Incurred Costs	$ 12,600,000		$ 26,500,000	$ 66,200,000
Thomas Amato | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Share Of Responsibility Of Verdict										10.00%
James Nelson | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury Verdict												$ 14,500,000
Share Of Responsibility Of Verdict												9.09%
Court judgment against all parties held responsible											$ 4,000,000.0
Additional interest on the compensation awarded											$ 10,000.00
Larry Bell | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Share Of Responsibility Of Verdict												5.00%
Frank Vincinguerra | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Share Of Responsibility Of Verdict										20.00%
Richard DeLisle | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment									$ 1,300,000
Jury Verdict									$ 8,000,000
Share Of Responsibility Of Verdict									16.00%
James Poage | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Compensatory Damages								$ 1,500,000
Additional Damages								10,000,000
Court Judgment								$ 10,800,000
George Coulbourn | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Additional Damages							$ 5,000,000
Court Judgment							6,800,000
Jury Verdict Total							$ 9,000,000
Share Of Responsibility Of Verdict							20.00%
New York | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | claim	18,000
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | claim	300
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | claim	100
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | claim	200