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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,879.5	$ 1,879.5
Accumulated Amortization	554.4	409.9
Net Carrying Amount	1,325.1	1,469.6
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,852.0	1,852.0
Accumulated Amortization	540.1	399.2
Net Carrying Amount	1,311.9	1,452.8
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3.6	3.6
Accumulated Amortization	1.8	1.4
Net Carrying Amount	1.8	2.2
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23.9	23.9
Accumulated Amortization	12.5	9.3
Net Carrying Amount	$ 11.4	$ 14.6

X

- Definition

Accumulated amount of 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 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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- Definition

Amount before 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 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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- Definition

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

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