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Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) LegalMatter | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 22, 2016 USD ($) | Sep. 30, 2014 USD ($) | Jun. 16, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Airplane Operating Lease Period Years |  |  |  | five |  |  |
Fair Value Of Residual Value Guarantee | $ 2.5 |  |  |  |  |  |
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold |  |  |  |  |  | $ 9.5 |
Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Beginning claims | 36,052 | 41,090 | 41,090 |  |  |  |
New claims | 818 | 980 | 2,826 |  |  |  |
Settlements | (301) | (394) | (924) |  |  |  |
Dismissals | (1,009) | (1,027) | (6,940) |  |  |  |
Ending claims | 35,560 | 40,649 | 41,090 | 41,090 |  |  |
New York | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Ending claims | LegalMatter | 18,300 |  |  |  |  |  |
Texas | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Ending claims | LegalMatter | 800 |  |  |  |  |  |
Mississippi | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Ending claims | LegalMatter | 4,700 |  |  |  |  |  |
OHIO | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Ending claims | LegalMatter | 200 |  |  |  |  |  |
George Coulbourn [Member] | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Court Judgment |  |  |  |  | $ 6.8 |  |
Ivan Sweberg [Member] | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Court Judgment |  |  |  |  |  |  | $ 5.3
Court_Reduced_Verdict |  |  |  |  |  |  | 10.0
Paid Judgment Pursuant to Appeal | $ 2.7 |  |  |  |  |  |
Selwyn Hackshaw [Member] | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Court Judgment |  |  |  |  |  |  | 3.1
Court_Reduced_Verdict |  |  |  |  |  |  | $ 6.0

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