Other Current and Non-Current Liabilities - Components of Other Current and Other Non-Current Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Other current liabilities:
Accrued salaries, wages and related costs	$ 164.9	$ 194.0
Accrued operating expenses	135.8	237.2
Accrued customer volume rebates	84.6	87.9
Accrued interest	38.2	38.5
Accrued employee benefit liability	5.4	4.4
Total	428.9	562.0
Other non-current liabilities:
Accrued employee benefit liability	172.0	169.3
Other postretirement liability	41.3	46.1
Other various liabilities	440.0	275.4
Total	653.3	$ 490.8
Accrued various expenses, related tax liabilities	$ 382.0