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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Apr. 30, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Unrecognized tax benefits (inclusive of interest and penalties)	$ 330.7		$ 286.1
Pension and other post-retirement benefits	178.4		296.6
Intangible Liabilities Noncurrent	0.0		50.4
Customer payable			35.5
Other	82.2		93.8
Other liabilities	$ 591.3	$ 565.4	$ 762.4

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