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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 57.2 | $ 55.4
Accumulated depreciation | $ 1,128.2 | $ 1,126.3

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