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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt Issuance Costs, Net | $ 87.0 |  |
Accounting Standards Update 2015-03 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt Issuance Costs, Net |  |  | $ 101.8
Accounting Standards Update 2015-17 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Tax Assets, Net |  |  | 39.1
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Unrecognized Tax Benefits that Would Result in Deferred Tax Assets |  | $ (4.3) | $ (28.4)
Goodwill [Member] | Accounting Standards Update 2015-16 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Goodwill, Purchase Accounting Adjustments | $ 3.3 |  |

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