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Changes in Redeemable Noncontrolling Interest Related to Acquisition Copal (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Redeemable Noncontrolling Interest [Line Items]    
Beginning balance $ 80.0 $ 72.3
Net earnings 9.3 5.8
Dividends (4.9) (6.0)
Payment to noncontrolling interest (183.8)  
Adjustment to redemption value $ 99.2 7.9
Ending balance   $ 80.0