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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

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