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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 30.3	$ 35.9
Accumulated depreciation	1,217.5	1,234.8
Intangible assets, accumulated amortization	$ 529.8	$ 498.0

- 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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