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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,879.5	$ 1,879.5
Accumulated Amortization	829.4	689.3
Net Carrying Amount	1,050.1	1,190.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,852.0	1,852.0
Accumulated Amortization	807.8	671.3
Net Carrying Amount	1,044.2	1,180.7
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3.6	3.6
Accumulated Amortization	2.6	2.2
Net Carrying Amount	1.0	1.4
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23.9	23.9
Accumulated Amortization	19.0	15.8
Net Carrying Amount	$ 4.9	$ 8.1

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 https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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 https://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
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