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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Pension and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash contributions, pension plans	$ 329.9	$ 45.9	$ 103.9
Cash contributions, postretirement benefits	333.0	47.7
Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	634.0
Pension Plans \| U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	600.0
Pension Plans \| International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	34.0
Postretirement Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	7.0	5.5
Cash contributions, postretirement benefits	$ 3.1	$ 1.8