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 |