Business and Geographic Segments - Net Property and Equipment by Segment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net property and equipment:
Net property and equipment	$ 796.4		$ 763.1		$ 723.8
United States
Net property and equipment:
Net property and equipment	232.8	[1]	211.9	[1]	189.0	[1]
Germany
Net property and equipment:
Net property and equipment	292.9		271.2		259.6
Canada
Net property and equipment:
Net property and equipment	67.1	[1]	73.0	[1]	80.0	[1]
Norway
Net property and equipment:
Net property and equipment	100.9		109.5		101.5
Belgium
Net property and equipment:
Net property and equipment	102.7		97.5		86.0
Taiwan
Net property and equipment:
Net property and equipment					$ 7.7	[1]

[1] Includes discontinued operations for 2011, see Note 3.