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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 EUR (€) | Jan. 15, 2021 | Oct. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Total Long-term debt | $ 858.6 | $ 1,354.6 |  |  |  |
Weighted average interest rate of Long-term debt | 4.30% | 4.30% | 4.30% |  |  |
Weighted average term of available Long-term debt | 4 years 6 months | 5 years 3 months 18 days |  |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 868.3 | $ 1,240.7 |  |  |  |
Senior Notes | Level 1 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fair value of Senior unsecured notes (Level 1) | 904.7 | 1,147.7 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | 0.0 | 130.0 |  |  |  |
Unamortized debt issuance costs | (1.2) | $ (1.9) |  |  |  |
4.75% Senior Unsecured Notes Due 2025 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) |  | 4.75% |  | 4.75% |  |
Long-term debt, gross | 0.0 | $ 400.0 |  |  |  |
Unamortized debt issuance costs | $ 0.0 | (4.3) |  |  |  |
3.625% Senior Unsecured Notes Due 2026 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) | 3.625% |  | 3.625% |  | 3.625% |
Long-term debt, gross | $ 468.3 | 440.7 | € 400 |  |  |
Unamortized debt issuance costs | $ (4.2) | (5.0) |  |  |  |
5.000% Senior Unsecured Notes Due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  | 5.00%
5.000% Senior Unsecured Notes Due 2028 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) | 5.00% |  | 5.00% |  |  |
Long-term debt, gross | $ 400.0 | 400.0 |  |  |  |
Unamortized debt issuance costs | $ (4.3) | $ (4.9) |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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