Stockholders' Equity - Summary of Cash Dividends Paid (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					36 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2014
Stockholders Equity [Abstract]
Total Cash Dividends Paid	$ 110.9	$ 102.0		$ 100.9		$ 313.8
Dividends per common share	$ 0.52	$ 0.52	[1]	$ 0.52	[1]

[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.