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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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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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