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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 38.2	$ 40.6
Accumulated depreciation	1,200.3	1,186.1
Intangible assets, accumulated amortization	$ 449.3	$ 416.9

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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