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Employee Stock And Savings (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Contribution | $ 27.6 | $ 26.6 | $ 29.5
Deferred compensation plan assets | 11.6 | 11.8 |
Deferred compensation plan liabilities | $ 11.6 | $ 11.8 |
Maximum percentage of salary deferral | 50.00% |  |
Maximum deferral bonus afftert Tax | 80.00% |  |

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