Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||
Net losses on assets held for sale and impaired | $ 0.0 | $ 0.0 | $ 26.3 |
Unrealized Gain (Loss) on Investments | 8.5 | ||
Investments, Fair Value Disclosure | $ 51.9 |