Debt and Credit Facilities - Lines of Credit (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Used lines of credit	$ 130.4	$ 81.6	[1]
Unused lines of credit	1,101.7	1,224.0
Total available lines of credit	$ 1,232.1	$ 1,305.6

[1] Certain amounts have been revised to reflect the retrospective application of the Company’s change in inventory costing method for certain U.S. inventories to the FIFO method from the LIFO method. Refer to Note 2, “Summary of Significant Accounting Policies - Inventories,” of the notes to consolidated financial statements for further details surrounding this accounting policy change.