Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Value of input used to measure contingent consideration liability from business combination.

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Fair value portion of notes payable.

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-Topic 210
-SubTopic 10
-Section S99
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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	3 Months Ended			9 Months Ended
FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Financial instruments
Change in fair value of contingent consideration liabilities	$ (1.1)		$ 9.0	$ 106.0	$ (8.4)
Previous Acquisitions
Financial instruments
Change in fair value of contingent consideration liabilities		$ 105.2
Level 2
Financial instruments
Notes payable fair value disclosure	$ 688.3			$ 688.3
Discount Rate \| Level 3 \| Minimum
Financial instruments
Contingent consideration liability measurement input	0.0004			0.0004
Discount Rate \| Level 3 \| Maximum
Financial instruments
Contingent consideration liability measurement input	0.090			0.090
Discount Rate \| Level 3 \| Weighted Average
Financial instruments
Contingent consideration liability measurement input	0.047			0.047
Probability of Milestone Achievement \| Level 3 \| Minimum
Financial instruments
Contingent consideration liability measurement input	0			0
Probability of Milestone Achievement \| Level 3 \| Maximum
Financial instruments
Contingent consideration liability measurement input	0.983			0.983
Probability of Milestone Achievement \| Level 3 \| Weighted Average
Financial instruments
Contingent consideration liability measurement input	0.648			0.648
Volatility of Future Revenue \| Level 3 \| Minimum
Financial instruments
Contingent consideration liability measurement input	0.370			0.370
Volatility of Future Revenue \| Level 3 \| Maximum
Financial instruments
Contingent consideration liability measurement input	0.400			0.400
Volatility of Future Revenue \| Level 3 \| Weighted Average
Financial instruments
Contingent consideration liability measurement input	0.381			0.381