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Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Changes in estimate during the period: |  |  |  |
Asbestos-related liability |  | $ 91.4 |  | $ 86.0
Asbestos-related assets(a) |  | 91.0 | [1] | 67.2
Noncurrent portion |  | 840.6 |  | 731.6
Noncurrent Asbestos Related Assets |  | 353.7 |  | 319.6
Asbestos Related Matters [Member] |  |  |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |  |  |
Net Balance, Beginning |  | 430.8 |  | 472.6
Changes in estimate during the period: |  |  |  |
Asbestos provision(a) | [2] | (30.8) |  | (47.9)
Asbestos remeasurement |  | 135.9 | [3] | (68.1)
Settlement Agreement |  | (100.4) |  |
Net cash activity and other(a) | [2] | (9.8) |  | (21.6)
Balance, Ending |  |  |  | 430.8
Net Balance, Ending |  | 487.3 |  | 430.8
Asbestos Related Matters [Member] | Liability [Member] |  |  |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |  |  |
Balance, Beginning |  | 817.6 |  | 849.3
Changes in estimate during the period: |  |  |  |
Asbestos provision(a) | [2] | (37.1) |  | (59.4)
Asbestos remeasurement |  | 155.7 | [3] | (4.5)
Settlement Agreement |  | 0.0 |  |
Net cash activity and other(a) | [2] | (78.4) |  | (86.6)
Balance, Ending |  | 932.0 |  | 817.6
Noncurrent portion |  |  |  | 731.6
Asbestos Related Matters [Member] | Asset [Member] |  |  |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |  |  |
Balance, Beginning |  | 386.8 |  | 376.7
Changes in estimate during the period: |  |  |  |
Asbestos provision(a) |  | 6.3 |  | 11.5
Asbestos remeasurement |  | (19.8) |  | (63.6)
Settlement Agreement |  | (100.4) |  | 0.0
Net cash activity and other(a) |  | 68.6 |  | 65.0
Balance, Ending |  | $ 444.7 |  | $ 386.8
[1] | The increase in asbestos-related assets as of December 31, 2020 primarily relates to a 2020 settlement agreement with an insurer accelerating payments previously included in a buyout agreement. Refer to Note 20, Commitments and Contingencies, for further information.
[2] | Includes certain administrative costs such as legal-related costs for insurance asset recoveries. The asbestos provision includes amounts to maintain a rolling 10-year provision prior to the transition in the third quarter of 2020 to full horizon.
[3] | In the third quarter of 2020, we extended our projection to include pending claims and claims expected to be filed through 2052, reflecting the full time period over which we expect asbestos-related claims to be filed against us.

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- Definition Asbestos Asset Gross Current and Non-current Beginning Balance + References No definition available. + Details
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- Definition Asbestos Asset Gross Current and Non-current Ending Balance + References No definition available. + Details
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- Definition Asbestos-related assets include both the probable insurance recoveries for the asbestos liabilities for pending claims, as well as unasserted claims to be filed over the next 10 years. + References No definition available. + Details
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- Definition The payments made in the period which reduced asbestos loss contingency reserves, net of associated insurance reimbursements. + References No definition available. + Details
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