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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,963.5	$ 1,879.5
Accumulated Amortization	971.7	829.4
Net Carrying Amount	991.8	1,050.1
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,852.0	1,852.0
Accumulated Amortization	942.9	807.8
Net Carrying Amount	909.1	1,044.2
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	87.6	3.6
Accumulated Amortization	7.1	2.6
Net Carrying Amount	80.5	1.0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23.9	23.9
Accumulated Amortization	21.7	19.0
Net Carrying Amount	$ 2.2	$ 4.9

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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 1
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-Publisher FASB
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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
-Topic 928
-SubTopic 340
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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