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Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Accounts receivable |  |  |  |  |
Accounts receivable, net of allowance |  |  |  | $ 2,705.6 | $ 2,344.0
Beneficial interest retained, percentage of accounts receivable |  |  |  | 10.00% |
Account receivable sold | $ 377.3 | $ 235.5 |  |  |
Retained beneficial interest | 15.9 | 11.4 |  |  |
Fees and interest paid under RPA | 12.4 | 4.8 | $ 2.8 |  |
Accounts receivable sold under repurchase agreement | 6,100.0 | 3,000.0 |  |  |
Amount collected of accounts receivables under repurchase agreement | 5,900.0 | 2,900.0 |  |  |
Minimum |  |  |  |  |
Accounts receivable |  |  |  |  |
Sale price of receivables, percentage of sold amount |  |  |  | 90.00% |
Minimum | LIBOR |  |  |  |  |
Accounts receivable |  |  |  |  |
Receivable, basis spread on variable rate |  |  |  | 1.00% |
Maximum |  |  |  |  |
Accounts receivable |  |  |  |  |
Sale price of receivables, percentage of sold amount |  |  |  | 100.00% |
Maximum | LIBOR |  |  |  |  |
Accounts receivable |  |  |  |  |
Receivable, basis spread on variable rate |  |  |  | 3.00% |
Allowance for bad debt |  |  |  |  |
Accounts receivable |  |  |  |  |
Allowance for bad debt | 27.8 | 25.0 | 25.0 | $ 27.8 | $ 24.9
Activities in allowance for bad debt |  |  |  |  |
Balance as of beginning of period | 24.9 | 25.0 | 25.7 |  |
Charges to provision for bad debt | 9.3 | 15.4 | 7.5 |  |
Write-off of uncollectible accounts receivable | (8.7) | (15.9) | (8.3) |  |
Recoveries of bad debt | 2.0 | 0.3 | 0.5 |  |
Translation Adjustments | 0.3 | 0.2 | (0.4) |  |
Balance as of end of period | $ 27.8 | $ 24.9 | $ 25.0 |  |

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