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Accounts Receivable - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, net | $ 1,415.9 |  | $ 2,891.9 |  |  |
Accounts receivable, allowance for credit losses | 48.6 |  | 35.5 |  |  |
Cumulative transition adjustment to retained earnings | $ 1,818.3 | $ 1,815.6 | 1,893.9 | $ 1,850.1 | $ 1,855.8 | $ 1,831.6
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |
Percent accounts receivable outstanding, less than 60 days | 91.00% |  |  |  |  |
Account receivable sold under the RPAs | $ 92.6 |  | $ 405.9 |  |  |
Fees and financing costs under the RPA | 5.5 | 13.3 |  |  |  |
Accounts receivable sold under RPAs | 2,200.0 | 4,200.0 |  |  |  |
Cash proceeds from sale of accounts receivables | $ 2,500.0 | 4,200.0 |  |  |  |
Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Sale price of receivables, percentage of sold amount | 100.00% |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Receivable, basis spread on variable rate |  |  | 3.00% |  |  |
London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Receivable, basis spread on variable rate |  |  | 1.00% |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Cumulative transition adjustment to retained earnings |  |  | $ (11.1) |  |  |
Retained Earnings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Cumulative transition adjustment to retained earnings | $ 1,768.6 | $ 1,669.7 | 1,761.3 | $ 1,785.1 | $ 1,639.3 | $ 1,606.1
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Cumulative transition adjustment to retained earnings |  |  | $ (11.1) |  |  |

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