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Supplemental Information (Components of Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of components of interest expense |  |  |
Interest expense, net of capitalized interest | $ 39.1 | $ 32.1 | $ 28.1
Interest income | 0.8 | 1.5 | 1.1
Interest expense, net | $ 38.3 | $ 30.6 | $ 27.0

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