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Debt (Narrative - 5.875% Senior Notes) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017
Debt Instrument [Line Items] |  |
Coupon rate | 5.875% |
Principal amount of debt outstanding | $ 2,520.0 | $ 3,107.5
5.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Discount Rate, Basis Spread on Treasury Rate | 0.50% |
Net Income, Amount Free of Restrictions | $ 468.1 |
Retained Earnings, Amount Free of Restrictions | $ 516.6 |
5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Coupon rate | 5.875% |
Principal amount of debt outstanding | $ 520.0 | $ 520.0
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed | 1.00% |
Prior to November 1, 2019 | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |
On or after November 1, 2019 | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 104.406% |
On or after November 1, 2020 | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 102.938% |
On or after November 1, 2021 | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 101.439% |
On or after November 1, 2022 | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |
Change in Control | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 101.00% |
Certain Asset Disposition | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |

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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/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 + Details
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