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Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,158.1	$ 2,844.5
Accumulated Amortization	(2,530.0)	(2,399.4)
Net Carrying Amount	1,628.1	445.1
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	3,330.9	2,131.5
Accumulated Amortization	(1,987.8)	(1,927.9)
Net Carrying Amount	1,343.1	$ 203.6
Trade name
Intangible Assets [Line Items]
Useful Life (Years)		20 years
Gross Carrying Amount	472.7	$ 422.8
Accumulated Amortization	(302.0)	(280.1)
Net Carrying Amount	170.7	142.7
Internally developed software
Intangible Assets [Line Items]
Gross Carrying Amount	352.0	280.6
Accumulated Amortization	(239.8)	(186.0)
Net Carrying Amount	112.2	94.6
Other
Intangible Assets [Line Items]
Gross Carrying Amount	2.5	9.6
Accumulated Amortization	(0.4)	(5.4)
Net Carrying Amount	$ 2.1	$ 4.2
Minimum | Customer relationships
Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Minimum | Trade name
Intangible Assets [Line Items]
Useful Life (Years)	1 year	1 year
Minimum | Internally developed software
Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Minimum | Other
Intangible Assets [Line Items]
Useful Life (Years)	1 year	1 year
Maximum | Customer relationships
Intangible Assets [Line Items]
Useful Life (Years)	14 years	14 years
Maximum | Trade name
Intangible Assets [Line Items]
Useful Life (Years)	20 years
Maximum | Internally developed software
Intangible Assets [Line Items]
Useful Life (Years)	5 years	5 years
Maximum | Other
Intangible Assets [Line Items]
Useful Life (Years)	10 years	10 years

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Publisher FASB
-Name Accounting Standards Codification
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