Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross carrying amount	$ 1,581.4	$ 4,217.6
Accumulated amortization	(1,091.7)	(3,645.5)
Net carrying amount	489.7	572.1
Customer relationships
Property, Plant and Equipment [Line Items]
Gross carrying amount	1,031.3	3,653.9
Accumulated amortization	(806.8)	(3,363.6)
Net carrying amount	224.5	290.3
Other
Property, Plant and Equipment [Line Items]
Gross carrying amount	550.1	563.7
Accumulated amortization	(284.9)	(281.9)
Net carrying amount	$ 265.2	$ 281.8