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Accounts Receivable Securitization Programs (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) bank | Sep. 30, 2017 USD ($) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€)
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Interest paid | $ 44,800,000 | $ 49,100,000 | $ 131,300,000 | $ 143,400,000 |  |  |
U.S. Accounts Receivable Securitization Program | U.S. Program |  |  |  |  |  |  |
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Number of banks involved in sale of fractional ownership interest of accounts receivable | bank |  |  | 2 |  |  |  |
Level of eligible assets available under accounts receivable securitization program |  |  | $ 60,000,000 |  |  |  |
Amount available for accounts receivable securitization program | 60,000,000 |  | 60,000,000 |  |  |  |
Amount utilized under accounts receivable securitization program | 0 |  | 0 |  |  | $ 0 |
U.S. Accounts Receivable Securitization Program | Maximum | U.S. Program |  |  |  |  |  |  |
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Maximum purchase limit for receivable interests under accounts receivable securitization program | 60,000,000 |  | 60,000,000 |  |  |  |
European Accounts Receivable Securitization Program | European Program |  |  |  |  |  |  |
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Amount available for accounts receivable securitization program | 85,500,000 |  | 85,500,000 |  | € 73,400,000 |  |
Amount utilized under accounts receivable securitization program | 83,900,000 |  | 83,900,000 |  | 72,000,000 |  | € 0
European Accounts Receivable Securitization Program | Maximum | European Program |  |  |  |  |  |  |
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Maximum purchase limit for receivable interests under accounts receivable securitization program | 93,100,000 |  | 93,100,000 |  | € 80,000,000 |  |
Accounts Receivable Securitization Programs |  |  |  |  |  |  |
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items] |  |  |  |  |  |  |
Interest paid | $ 200,000 | $ 600,000 | $ 400,000 | $ 1,000,000 |  |  |

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