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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Unrecognized tax benefits (inclusive of interest and penalties) | $ 253.3 | $ 323.1
Pension and other post-retirement benefits | 227.4 | 246.7
Intangible Liabilities Noncurrent | 50.6 | 52.1
Operating Lease, Liability, Noncurrent | 40.6 | 51.8
Deferred Tax Liabilities, Net | 37.3 | 99.0
Supplemental executive retirement plan liabilities | 22.2 | 26.7
Personnel costs | 15.7 | 24.5
Deferred revenue | 7.1 | 9.7
Other | 42.7 | 33.8
Other liabilities | $ 696.9 | $ 867.4

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