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Fair Value Measurements (Carrying Values And Fair Values Of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Senior Notes | 5.875% Senior Notes |  |  |
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items] |  |  |
Coupon rate |  | 5.875% |
Convertible Senior Subordinated Notes |  |  |
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items] |  |  |
Coupon rate |  | 1.25% |
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items] |  |  |
Coupon rate |  | 1.25% |
Carrying Value |  |  |
Assets: |  |  |
Investment in Pop's mandatorily redeemable preferred stock units |  | $ 96.4 | $ 96.8
Liabilities: |  |  |
Total liabilities, fair value disclosure |  | 2,692.1 | 3,428.1
Carrying Value | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure |  | 928.1 | 961.8
Carrying Value | Term Loan | Term Loan B-1 Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | 806.1 |
Carrying Value | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] |  | 1,554.7
Carrying Value | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure |  | 500.0 | 498.3
Carrying Value | Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures |  | 60.0 | 60.0
Carrying Value | Production Loans | Production Loans |  |  |
Liabilities: |  |  |
Loans, fair value disclosure |  | 397.9 | 353.3
Fair Value | Fair Value (Level 3) |  |  |
Assets: |  |  |
Investment in Pop's mandatorily redeemable preferred stock units |  | 122.1 | 122.1
Fair Value | Fair Value (Level 2) |  |  |
Liabilities: |  |  |
Total liabilities, fair value disclosure |  | 2,791.0 | 3,548.2
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure |  | 957.7 | 983.8
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B-1 Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | 826.0 |
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] |  | 1,610.0
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure |  | 549.3 | 542.1
Fair Value | Fair Value (Level 2) | Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures |  | 59.6 | 58.5
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans |  |  |
Liabilities: |  |  |
Loans, fair value disclosure |  | $ 398.4 | $ 353.8
[1] | As of March 31, 2017, amounts were outstanding under the previous Term Loan B facility (see Note 6).

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