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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Unrecognized tax benefits (inclusive of interest and penalties)	$ 323.1	$ 177.0
Liability, Defined Benefit Plan, Noncurrent	246.7	0.0
Deferred Tax Liabilities, Net, Noncurrent	99.0	70.7
Intangible Liabilities Noncurrent	52.1	53.5
Operating Lease, Liability, Noncurrent	51.8	0.0
Supplemental executive retirement plan liabilities	26.7	28.1
Personnel costs	24.5	25.1
Deferred revenue	9.7	20.5
Other Accrued Liabilities, Noncurrent	33.8	21.1
Other liabilities	$ 867.4	$ 396.0

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