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Supplemental Financial Information - Deductions Related to Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Supplemental Cash Flow Information [Abstract] |  |  |
Cash paid for income taxes | $ 77.6 | $ 25.9 | $ 48.4
Cash paid for interest on borrowings | 347.9 | 85.3 | 82.5
Valuation Allowance of Deferred Tax Assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 204.5 | 210.1 | 161.8
Additions Charged to Costs and Expenses | 16.2 | 36.2 | 15.2
Additions Charged to Other Accounts | 175.8 | 0.0 | 37.6
Deductions | (64.4) | (41.8) | (4.5)
Balance at End of Year | 332.1 | 204.5 | 210.1
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 2.2 | 2.1 | 2.5
Additions Charged to Costs and Expenses | 0.0 | 0.2 | 0.2
Deductions | (0.2) | (0.1) | (0.6)
Balance at End of Year | $ 2.0 | $ 2.2 | $ 2.1

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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