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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,879.5 | $ 1,879.5
Accumulated Amortization | 409.9 | 257.9
Net Carrying Amount | 1,469.6 | 1,621.6
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,852.0 | 1,852.0
Accumulated Amortization | 399.2 | 250.8
Net Carrying Amount | 1,452.8 | 1,601.2
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3.6 | 3.6
Accumulated Amortization | 1.4 | 1.0
Net Carrying Amount | 2.2 | 2.6
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23.9 | 23.9
Accumulated Amortization | 9.3 | 6.1
Net Carrying Amount | $ 14.6 | $ 17.8

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- 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 + Details
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