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Description of Business, Basis of Presentation and Significant Accounting Policies (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Change in Accounting Estimate [Line Items]
Finite-lived intangible assets			$ 1,325.1	$ 1,469.6
Customer relationships
Change in Accounting Estimate [Line Items]
Finite-lived intangible assets			$ 1,311.9	$ 1,452.8
Finite-Lived Intangible Asset, Useful Life	17 years	17 years
Minimum
Change in Accounting Estimate [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Maximum
Change in Accounting Estimate [Line Items]
Finite-Lived Intangible Asset, Useful Life			17 years

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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