Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Current
Trade accounts receivable	$ 498.9	$ 457.5
Trade notes receivable	1.4	0.5
Total trade receivables	500.3	458.0
Other notes receivable:
Other notes receivable	0.0	0.0
Income tax receivables	11.9	32.6
Other receivables	32.5	38.9
Subtotal other receivables	44.4	71.5
Total trade and other receivables	544.7	529.5
Allowance for doubtful accounts:
Trade accounts receivable	(9.9)	(9.2)
Trade notes receivable	(0.1)	(0.1)
Total trade receivables	(10.0)	(9.3)
Other notes receivable	0.0	0.0
Total allowance for doubtful accounts	(10.0)	(9.3)
Total net receivables	534.7	520.2
Long-term
Trade accounts receivable	0.0	0.0
Trade notes receivable	0.6	0.6
Total trade receivables	0.6	0.6
Other notes receivable:
Other notes receivable	0.4	0.4
Income tax receivables	0.0	0.0
Other receivables	0.0	0.0
Subtotal other receivables	0.4	0.4
Total trade and other receivables	1.0	1.0
Allowance for doubtful accounts:
Trade accounts receivable	0.0	0.0
Trade notes receivable	(0.2)	(0.2)
Total trade receivables	(0.2)	(0.2)
Other notes receivable	(0.4)	(0.4)
Total allowance for doubtful accounts	(0.6)	(0.6)
Total net receivables	$ 0.4	$ 0.4