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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Tax receivables | $ 66.3 | $ 66.8
Right-of-use assets | 39.0 | 35.8
Deferred Income Tax Assets, Net | 22.7 | 21.9
Supplemental executive retirement plan assets | 18.7 | 22.6
Other | 25.8 | 29.1
Other assets, net | $ 172.5 | $ 176.2

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