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Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Aggregate maximum payout amount | $ 153.0 |  | $ 153.0 |  |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration | 75.0 |  | 75.0 |  | $ 70.8
Change in the fair value of contingent consideration liabilities | 4.4 | $ (6.3) | 4.3 | $ (6.3) |
Level 3 | Acquisition Without Maximum Earn-out |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration | $ 1.0 |  | $ 1.0 |  |
Volatility | Level 3 | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.222 |  | 0.222 |  |
Volatility | Level 3 | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.300 |  | 0.300 |  |
Discount Rate | Level 3 | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.021 |  | 0.021 |  |
Discount Rate | Level 3 | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.039 |  | 0.039 |  |

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