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Fair Value Measurements (Carrying Values of Assets and Liabilities Not Required to Be Carried at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
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% |
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 | 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 |  | $ 91.3 | $ 96.8
Liabilities: |  |  |
Total liabilities, fair value disclosure |  | 2,872.0 | 3,428.1
Carrying Value | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure |  | 500.4 | 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 |  | 352.6 | 353.3
Carrying Value | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | 729.7 | 961.8
Carrying Value | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | 1,229.3 | 1,554.7
Fair Value | Fair Value (Level 3) |  |  |
Assets: |  |  |
Investment in Pop's Mandatorily Redeemable Preferred Stock Units |  | 125.0 | 122.1
Fair Value | Fair Value (Level 2) |  |  |
Liabilities: |  |  |
Total liabilities, fair value disclosure |  | 2,955.2 | 3,548.2
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure |  | 539.5 | 542.1
Fair Value | Fair Value (Level 2) | Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures |  | 60.3 | 58.5
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans |  |  |
Liabilities: |  |  |
Loans, fair value disclosure |  | 352.9 | 353.8
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | 750.9 | 983.8
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | [1] | $ 1,251.6 | $ 1,610.0
[1] | As of March 31, 2017, amounts were outstanding under the Previous Term Loan A and Previous Term Loan B (see Note 7).

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