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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 290.2 $ 286.1
Pension and other post-retirement benefits 270.2 296.6
Intangible Liabilities Noncurrent 50.1 50.4
Operating Lease, Liability, Noncurrent 21.1 21.6
Supplemental executive retirement plan liabilities 19.0 22.9
Deferred Tax Liabilities, Net 15.7 13.7
Deferred revenue 13.9 14.3
Personnel costs 13.6 11.8
Customer payable   35.5
Other 10.8 9.5
Other liabilities $ 704.6 $ 762.4