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Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Accounts receivable |  |  |  |  |
Accounts receivable, net of allowance |  |  |  | $ 2,344.0 | $ 1,812.6
Allowance for bad debt |  |  |  |  |
Accounts receivable |  |  |  |  |
Allowance for bad debt | $ 25.0 | $ 25.7 | $ 29.2 | $ 24.9 | $ 25.0
Activities in allowance for bad debt |  |  |  |  |
Balance as of beginning of period | 25.0 | 25.7 | 29.2 |  |
Charges to provision for bad debt | 15.4 | 7.5 | 3.8 |  |
Write-off of uncollectible accounts receivable | (15.9) | (8.3) | (8.0) |  |
Recoveries of bad debt | 0.3 | 0.5 | 0.8 |  |
Translation Adjustments | 0.2 | (0.4) | 0.0 |  |
Balance as of end of period | $ 24.9 | $ 25.0 | $ 25.7 |  |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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