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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Mar. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,879.5 | $ 1,879.5
Accumulated Amortization | 689.3 | 554.4
Net Carrying Amount | 1,190.2 | 1,325.1
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,852.0 | 1,852.0
Accumulated Amortization | 671.3 | 540.1
Net Carrying Amount | 1,180.7 | 1,311.9
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3.6 | 3.6
Accumulated Amortization | 2.2 | 1.8
Net Carrying Amount | 1.4 | 1.8
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23.9 | 23.9
Accumulated Amortization | 15.8 | 12.5
Net Carrying Amount | $ 8.1 | $ 11.4

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