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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 240.1 $ 323.1
Pension and other post-retirement benefits 230.3 246.7
Intangible Liabilities Noncurrent 50.8 52.1
Operating Lease, Liability, Noncurrent 44.1 51.8
Deferred Tax Liabilities, Net 37.1 99.0
Supplemental executive retirement plan liabilities 22.7 26.7
Personnel costs 15.1 24.5
Deferred revenue 11.2 9.7
Other 41.8 33.8
Other liabilities $ 693.2 $ 867.4