Other Comprehensive Income - Additional Information (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Disclosure Other Comprehensive Income Additional Information [Abstract]
Accumulated other comprehensive income (loss), unrecognized pension benefit costs	$ 7.5	$ 7.5
Accumulated other comprehensive income (loss), foreign currency translation adjustments	12.8	11.2
Accumulated other comprehensive income (loss), unrealized loss on interest rate swaps	$ 1.7	$ 1.7

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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