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Recent Accounting Pronouncements (Narrative) (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Accounting Policies [Abstract]  
Estimated reclassification of the cumulative effect from accumulated other comprehensive income to retained earnings for equity investments. $ 0.3
Estimated reclassification of the cumulative effect from retained earning to accumulated other comprehensive income for financial liabilities $ 100.0