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Debt (Narrative - 5.875% Senior Notes) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 28, 2018 | Oct. 27, 2016
Debt Instrument [Line Items] |  |  |
Basis spread on treasury rate | 0.50% |  |
5.875% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net loss, amount free of restrictions | $ (160.6) |  |
Retained earnings, amount free of restrictions | $ 332.3 |  |
5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Coupon rate | 5.875% |  |
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed | 1.00% |  |
2016 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount issued |  |  | $ 520.0
2018 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount issued |  | $ 512.3 |
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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