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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2016
Entity Information [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 15.9 |  |  | $ 16.3
Maximum |  |  |  |
Entity Information [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Minimum |  |  |  |
Entity Information [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  |
All Customers [Member] [Member] |  |  |  |
Entity Information [Line Items] |  |  |  |
Concentration Risk, Percentage | 41.00% | 45.00% | 41.00% |

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