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Contingent consideration Contingent consideration - Fair Value Level 3 of Significant Unobservable Inputs (Details) $ in Millions | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value | $ 29.1 | $ 29.2
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value | $ 29.1 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Discount rate | Minimum |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.025 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Discount rate | Maximum |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.086 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Discount rate | Weighted Average |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.043 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Probability of payment | Minimum |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.100 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Probability of payment | Maximum |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.400 |
Discounted cash flow | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Probability of payment | Weighted Average |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business combination, contingent consideration, liability, measurement input | 0.209 |

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