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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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