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Debt (Schedule of Debt Repayments and Redemptions) (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 17, 2015 | Mar. 31, 2017 | Mar. 31, 2015 | Mar. 31, 2016
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors | $ 4.5 |  |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | $ 0.5 |  | $ 0.4
Senior Secured Second-Priority Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  | 128.5 |  |
Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  | 22.5 |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 13.4 |  |
Total costs associated with redeemed debt |  | 35.9 |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  | 92.6 |  |
Revolving Credit Facility |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 2.6 |  |
New costs incurred to issue the new revolving credit facility |  | 20.5 |  |
Total debt issuance and redemption costs |  | 23.1 |  |
Term Loan | Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  |  | $ 4.5 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  |  | 14.4 |
Total costs associated with redeemed debt |  |  | 18.9 |
Term Loan | Term Loan Due 2022 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  |  | 4.9 |
Term Loan | Term Loan Due 2022 and Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  |  | 23.8 |
Debt Issuance Costs Call Premium and Unamortized Discount | Senior Secured Second-Priority Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  | 104.0 |  |
Debt Issuance Costs Call Premium and Unamortized Discount | Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  | 10.7 |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 9.5 |  |
Total costs associated with redeemed debt |  | 20.2 |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  | 83.8 |  |
Debt Issuance Costs Call Premium and Unamortized Discount | Revolving Credit Facility |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 2.0 |  |
New costs incurred to issue the new revolving credit facility |  | 20.5 |  |
Total debt issuance and redemption costs |  | 22.5 |  |
Debt Issuance Costs Call Premium and Unamortized Discount | Term Loan | Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  |  | 2.8 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  |  | 8.8 |
Total costs associated with redeemed debt |  |  | 11.6 |
Debt Issuance Costs Call Premium and Unamortized Discount | Term Loan | Term Loan Due 2022 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  |  | 1.8 |
Debt Issuance Costs Call Premium and Unamortized Discount | Term Loan | Term Loan Due 2022 and Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  |  | 13.4 |
Loss on Extinguishment of Debt | Senior Secured Second-Priority Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  | 24.5 |  |
Loss on Extinguishment of Debt | Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  | 11.8 |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 3.9 |  |
Total costs associated with redeemed debt |  | 15.7 |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  | 8.8 |  |
Loss on Extinguishment of Debt | Revolving Credit Facility |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  | 0.6 |  |
New costs incurred to issue the new revolving credit facility |  | 0.0 |  |
Total debt issuance and redemption costs |  | $ 0.6 |  |
Loss on Extinguishment of Debt | Term Loan | Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors |  |  | 1.7 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt |  |  | 5.6 |
Total costs associated with redeemed debt |  |  | 7.3 |
Loss on Extinguishment of Debt | Term Loan | Term Loan Due 2022 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B |  |  | 3.1 |
Loss on Extinguishment of Debt | Term Loan | Term Loan Due 2022 and Term Loan Due 2020 |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Total debt issuance and redemption costs |  |  | $ 10.4 |

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