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v3.20.1

Debt (Narrative - Senior Notes) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019
Debt Instrument [Line Items] |  |
Principal amount of debt outstanding | $ 2,741.9 | $ 2,927.5
5.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Discount Rate, Basis Spread on Treasury Rate | 0.50% |
5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Coupon rate | 5.875% |
Principal amount of debt outstanding | $ 518.7 | 520.0
6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Coupon rate | 6.375% |
Principal amount of debt outstanding | $ 545.6 | $ 550.0
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed | 1.00% |
5.875% Senior Notes and 6.375% Senior Notes |  |
Debt Instrument [Line Items] |  |
Net Loss, Amount Free of Restrictions | $ 206.4 |
Accumulated Deficit, Amount Free of Restrictions | $ 16.9 |
Debt instrument, redemption, period one | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 104.406% |
Debt instrument, redemption, period one | 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |
Debt instrument, redemption, period two | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 102.938% |
Debt instrument, redemption, period two | 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 103.188% |
Debt instrument, redemption, period three | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 101.439% |
Debt instrument, redemption, period three | 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 101.594% |
Debt instrument, redemption, period four | 5.875% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |
Debt instrument, redemption, period four | 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |
Change in Control | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 101.00% |
Certain Asset Disposition | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument redemption price percentage | 100.00% |

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