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Fair Value Measurement - Reconciliation of Beginning and Ending Balances for Level 3 Contingent Liabilities (Details) - Level 3 - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 32.3	$ 19.9
Additions	1.7
Fair value adjustments	(8.7)	6.8
Balance at end of period	0.6	25.1
Earnout Payments
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments made for contingent liabilities	(1.5)	$ (1.6)
Change of Control | Class A Common Stock | Restricted Stock Units
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments made for contingent liabilities	$ (23.2)

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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