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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