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Fair Value Of Assets And Liabilities (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 27, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted cash | $ 40.1 |  | $ 31.2 |
Big Fish Games deferred payment | (26.4) | $ 0.0 |  |
Long-term debt, net of current maturities and loan origination fees | 389.0 |  | 632.9 |
Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents and restricted cash |  |  | 31.2 |
Fair Value, Inputs, Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-term Debt, Fair Value | 0.0 |  | 622.5 |
Unsecured Debt [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-term Debt, Fair Value | $ 463.2 |  | $ 496.8 |
Senior Notes Due 2028 [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.75%
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 700.0
Secured Debt [Member] | Term Loan B due 2024 [Member] | Line of Credit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400.0

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