Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross carrying amount	$ 5,650.3	$ 5,405.1
Accumulated amortization	(3,762.5)	(3,469.7)
Net carrying amount	1,887.8	1,935.4
Customer Relationships [Member]
Property, Plant and Equipment [Line Items]
Gross carrying amount	5,095.0	4,862.4
Accumulated amortization	(3,512.8)	(3,240.3)
Net carrying amount	1,582.2	1,622.1
Other [Member]
Property, Plant and Equipment [Line Items]
Gross carrying amount	555.3	542.7
Accumulated amortization	(249.7)	(229.4)
Net carrying amount	$ 305.6	$ 313.3

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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