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Interim Financial Statements - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Recent Accounting Pronouncements |  |  |
Decrease in other current assets due to reclassification related to ASU |  | $ (96.5) | $ (73.9)
Accounting Standards Update 2015-17 |  |  |
Recent Accounting Pronouncements |  |  |
Decrease in other current assets due to reclassification related to ASU |  |  | 28.1
Decrease in deferred tax liabilities due to reclassification related to ASU |  |  | $ 28.1
Accounting Standards Update 2016-09 |  |  |
Recent Accounting Pronouncements |  |  |
Employee taxes paid related to share-based compensation, ASU reclassification adjustment to operating activities | $ 6.1 |  |
Employee taxes paid related to share-based compensation, ASU reclassification adjustment to financing activities | $ 6.1 |  |

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