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Other Post-Employment Benefits and Other Employee Benefit Plans - Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Benefit Cost (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Unrecognized prior service costs $ (0.2)
Unrecognized net actuarial loss (5.1)
Total (5.3)
Other Post-Employment Benefits and Other Employee Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Unrecognized prior service costs (0.3)
Unrecognized net actuarial loss (0.2)
Total $ (0.5)