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Supplemental Information (Components of Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summary of components of interest expense |  |  |
Interest expense, net of capitalized interest | $ 39.8 | $ 26.0 | $ 29.7
Less: Interest income | 1.1 | 1.0 | 1.4
Interest expense, net | $ 38.7 | $ 25.0 | $ 28.3

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