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Financial Instruments and Risk Management - Tax Receivable Agreement Rollforward (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning liability balance, January 1, 2020 $ 0.0
Tax receivable agreement, initially recorded 133.4
Change in fair value (0.1)
Ending liability balance, June 30, 2020 $ 133.3