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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Supplemental Financial Information [Abstract] |  |  |
Unrecognized tax benefits (inclusive of interest and penalties) | $ 298.8 |  | $ 286.1
Pension and other post-retirement benefits | 182.8 |  | 296.6
Intangible Liabilities Noncurrent | 0.0 |  | 50.4
Customer payable |  |  | 35.5
Other | 88.2 |  | 93.8
Other liabilities | $ 569.8 | $ 565.4 | $ 762.4

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