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Segment and Geographic Information - Identifiable Assets Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Identifiable assets:
Identifiable assets	$ 919.2	$ 870.2
United States [Member]
Identifiable assets:
Identifiable assets	821.7	768.6
Canada [Member]
Identifiable assets:
Identifiable assets	$ 97.5	$ 101.6

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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