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Employee Benefits - Postretirement Amounts Included in Accumulated Other Comprehensive Income (Detail) - Other Postretirement Plan - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net Actuarial Loss / (Gain) $ (6.5) $ 3.9
Prior Service Cost 0.0 0.0
Gross Amount in Accumulated Other Comprehensive Income (6.5) 3.9
Income Tax Effect (2.2) 1.5
Net Amount in Accumulated Other Comprehensive Income $ (4.3) $ 2.4