Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| Proceeds from sales | $ 34.2 | $ 29.9 | $ 61.8 | $ 65.1 |
| Realized gross gains on sales | 0.1 | 0.1 | 0.3 | 0.2 |
| Realized gross losses on sales | $ 1.0 | $ 0.7 | $ 1.7 | $ 1.5 |