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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheet (Parenthetical) [Abstract]
Allowance for doubtful accounts	$ 33.0	$ 35.9
Accumulated depreciation	1,205.3	1,234.8
Intangible assets, accumulated amortization	$ 515.0	$ 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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