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Investments (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Feb. 26, 2018 | Jun. 20, 2017 | Jun. 16, 2017 | Jan. 30, 2017 | Dec. 31, 2016 | Oct. 14, 2016
Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments | $ 61.3 |  |  |  |  | $ 28.2 |
Cost Method Investments | $ 46.8 |  |  |  |  | $ 32.8 |
RLJE [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 65.0
Investment Warrants, Exercise Price | $ 3.00 |  |  |  |  |  |
Ownership Interest In Investment Upon Full Exercise Of Warrants | 100.00% |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, before Tax | $ 2.2 |  |  |  |  |  |
RLJE [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Business Acquisition, Share Price |  | $ 4.25 |  |  |  |  |
RLJE [Member] | Expire On The Fifth Anniversary Of Closing Date [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Warrants Received per RLJE Investment Agreement |  |  |  |  |  |  | 5,000,000
RLJE [Member] | Expire On The Sixth Anniversary Of Closing Date [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Warrants Received per RLJE Investment Agreement |  |  |  |  |  |  | 10,000,000
RLJE [Member] | Expire On The Seventh Anniversary Of Closing Date [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Warrants Received per RLJE Investment Agreement |  |  |  |  |  |  | 5,000,000
RLJE [Member] | Minimum [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Warrants Received per RLJE Investment Agreement |  |  |  |  |  |  | 20,000,000
RLJE [Member] | Tranche A Loan [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 13.0 |  | $ 5.0
Debt Instrument, Interest Rate, Stated Percentage | 7.00% |  |  |  |  |  |
Shares Acquired from Exercise of Warrants |  |  | 1,667,000 |  |  |  |
RLJE [Member] | Tranche B Loan [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 55.0 |  |  |  | 60.0
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |  |  |  |  |
Debt Instrument, Face Amount, Due on Fifth Anniversary |  |  |  |  |  |  | 15.0
Debt Instrument, Face Amount, Due on Sixth Anniversary |  |  |  |  |  |  | $ 30.0
Loan Forgiven in Lieu of Exercise Price for Warrants Exercised |  |  | $ 5.0 |  |  |  |
RLJE [Member] | Tranche A-2 Loan [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 10.0 |  |  |

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