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Fair value measurements
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value measurements
15. Fair value measurements
The following is a reconciliation of the fair value measurements that use significant unobservable inputs (Level 3):
(in millions)Warrant Liability
Fair value as of December 31, 2019$33.0 
Fair value adjustments(6.4)
Fair value as of September 30, 2020$26.6 
The assumptions used in the Black-Scholes-Merton valuation model to measure the fair value of the warrants are:
Weighted Average
Unobservable InputsRangeAmountMethod
Warrant lifeN/A2 yearsExpected term
Expected volatility
28.75% to 61.86%
43.61%Industry peer group
Risk-free interest rateN/A0.13%US Treasury rates
Fair value adjustments are recorded within other operating expenses, net in the condensed consolidated statement of operations.