Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross carrying amount	$ 885.4	$ 4,217.6
Accumulated amortization	(506.5)	(3,645.5)
Net carrying amount	378.9	572.1
Customer relationships
Property, Plant and Equipment [Line Items]
Gross carrying amount	292.6	3,653.9
Accumulated amortization	(180.9)	(3,363.6)
Net carrying amount	111.7	290.3
Other
Property, Plant and Equipment [Line Items]
Gross carrying amount	592.8	563.7
Accumulated amortization	(325.6)	(281.9)
Net carrying amount	$ 267.2	$ 281.8