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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Operating Lease, Right-of-Use Asset | $ 58.1 | $ 0.0
Income Taxes Receivable, Current | 36.3 | 8.4
Deferred tax assets | 26.6 | 29.4
Supplemental executive retirement plan assets | 26.0 | 27.2
Finite-Lived Intangible Assets, Net | 11.9 | 2.5
Deferred mobilization costs | 7.1 | 13.5
Other | 22.3 | 16.8
Other assets, net | $ 188.3 | $ 97.8

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