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Business Combinations (Details) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) acquisition | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of Businesses Acquired | acquisition |  | 2 |  |  |
Payments to Acquire Businesses | $ 1,800.0 | $ 28.3 |  |  |
Cash Acquired from Acquisition |  | 3.8 |  |  |
Business Combinations, Guaranteed Deferred Acquisition Obligation |  | 6.5 | $ 0.0 |  |
Business Combination, contingent earn-out consideration |  | 1.5 | $ 1.7 |  |
Goodwill, Acquired During Period |  | 39.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 10.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | (4.7) |  |  |
Redeemable Noncontrolling Interest |  | $ 8.5 |  | $ 0.0 | $ 3.8
Document Period End Date |  | Jun. 30, 2019 |  |  |
Payment for Contingent Consideration Liability, Total |  | $ 45.5 |  |  |
Goodwill, Purchase Accounting Adjustments |  | 1.0 |  |  |
Intangible Assets, Current |  | 0.5 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  | (1.5) |  |  |
Net of NCI Income [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Redeemable Noncontrolling Interest |  | $ 8.4 |  |  |

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