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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Unrecognized tax benefits (inclusive of interest and penalties) | $ 233.4 | $ 323.1
Deferred Tax Liabilities, Net | 35.2 | 99.0
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent | 243.1 | 246.7
Intangible Liabilities Noncurrent | 51.5 | 52.1
Operating Lease, Liability, Noncurrent | 48.0 | 51.8
Supplemental executive retirement plan liabilities | 21.6 | 26.7
Deferred tax liabilities | 13.9 | 24.5
Deferred revenue | 8.8 | 9.7
Other | 40.2 | 33.8
Other liabilities | $ 695.7 | $ 867.4

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