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Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 55.4 |  | $ 63.1 |  | $ (66.0) |
Charges to costs and expenses | 16.3 |  | 10.4 |  | 10.7 |
Reversals to other accounts | (0.2) | [1] | (0.5) | [1] | (0.4) | [1]
Deductions: |  |  |  |  |  |
Dispositions | (0.4) |  | 0 |  | (0.5) |
Uncollectible accounts written off | (12.6) |  | (16.3) |  | (11.8) |
Foreign currency translation adjustment | 0.5 |  | (1.3) |  | (0.9) |
Balance at end of period | $ 59.0 |  | $ 55.4 |  | $ 63.1 |
[1] | Amounts primarily relate to miscellaneous other amounts and reclassifications.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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