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Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2021 | Jun. 30, 2022
Business Combination Separately Recognized Transactions [Line Items] |  |
Cash paid |  | $ 500.9
Common stock issued | $ 4.9 | 0.0
Other payable |  | 1.2
Recorded earn-out payable |  | 16.9
Net assets acquired |  | 519.0
Orchid Intermediate Holdings L P |  |
Business Combination Separately Recognized Transactions [Line Items] |  |
Net assets acquired |  | $ 487.0
Orchid Intermediate Holdings L P | National Programs |  |
Business Combination Separately Recognized Transactions [Line Items] |  |
Effective date of acquisition |  | Mar. 31, 2022
Cash paid |  | $ 476.2
Common stock issued |  | 0.0
Other payable |  | 0.0
Recorded earn-out payable |  | 10.8
Net assets acquired |  | 487.0
Maximum potential earn- out payable |  | 20.0
Other Acquisitions |  |
Business Combination Separately Recognized Transactions [Line Items] |  |
Net assets acquired |  | 32.0
Other Acquisitions | Various |  |
Business Combination Separately Recognized Transactions [Line Items] |  |
Cash paid |  | 24.7
Common stock issued |  | 0.0
Other payable |  | 1.2
Recorded earn-out payable |  | 6.1
Net assets acquired |  | 32.0
Maximum potential earn- out payable |  | 8.8
2022 Acquisition |  |
Business Combination Separately Recognized Transactions [Line Items] |  |
Maximum potential earn- out payable |  | $ 28.8

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