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Retirement Plans - Amounts Recognized on Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit cost (included in accrued liabilities) $ (780.4) $ (867.3)
Pension liabilities (514.4) (616.1)
Other postretirement benefits plan liabilities (168.8) (210.8)
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension cost (included in other noncurrent assets) 15.2 14.4
Accrued benefit cost (included in accrued liabilities) (11.5) (8.7)
Pension liabilities (514.4) (616.1)
Other postretirement benefits plan liabilities 0.0 0.0
Net liabilities recognized in the Consolidated Balance Sheets (510.7) (610.4)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension cost (included in other noncurrent assets) 0.0 0.0
Accrued benefit cost (included in accrued liabilities) (0.8) (1.2)
Pension liabilities 0.0 0.0
Other postretirement benefits plan liabilities (168.8) (210.8)
Net liabilities recognized in the Consolidated Balance Sheets $ (169.6) $ (212.0)