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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, 2017 | Dec. 08, 2016 | Mar. 31, 2016
--- | --- | --- | ---
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 | January 2012 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 | 4.00% |  |
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% |  |
Senior Secured Second-Priority Notes | 5.25% 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 | 5.25% |  |
Term Loan | Term Loan Due 2022 |  |  |
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 |  | 5.00% |
Carrying Value |  |  |
Assets: |  |  |
Investment in Pop's Mandatorily Redeemable Preferred Stock Units | $ 96.8 |  | $ 98.7
Liabilities: |  |  |
Total liabilities, fair value disclosure | 3,428.1 |  | 1,399.0
Carrying Value | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure | 498.3 |  | 0.0
Carrying Value | Convertible Senior Subordinated Notes | January 2012 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures | 0.0 |  | 40.0
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 | 353.3 |  | 690.0
Carrying Value | Senior Secured Second-Priority Notes | 5.25% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 220.8
Carrying Value | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 961.8 |  | 0.0
Carrying Value | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 1,554.7 |  | 0.0
Carrying Value | Term Loan | Term Loan Due 2022 |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 0.0 |  | 388.2
Fair Value | Fair Value (Level 3) |  |  |
Assets: |  |  |
Investment in Pop's Mandatorily Redeemable Preferred Stock Units | 122.1 |  | 114.5
Fair Value | Fair Value (Level 2) |  |  |
Liabilities: |  |  |
Total liabilities, fair value disclosure | 3,548.2 |  | 1,416.1
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure | 542.1 |  | 0.0
Fair Value | Fair Value (Level 2) | Convertible Senior Subordinated Notes | January 2012 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures | 0.0 |  | 41.5
Fair Value | Fair Value (Level 2) | Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Liabilities: |  |  |
Convertible notes, fair value disclosures | 58.5 |  | 54.2
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 353.8 |  | 690.4
Fair Value | Fair Value (Level 2) | Senior Secured Second-Priority Notes | 5.25% Senior Notes |  |  |
Liabilities: |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 229.5
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 983.8 |  | 0.0
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | 1,610.0 |  | 0.0
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan Due 2022 |  |  |
Liabilities: |  |  |
Loans, fair value disclosure | $ 0.0 |  | $ 400.5

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