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New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Jan. 01, 2019
Retained Earnings | Accounting Standards Update 2018-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassifications due to adoption of accounting standard |  | $ 6.5 |
Other Nonoperating Income (Expense) | Accounting Standards Update 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassifications due to adoption of accounting standard | $ (0.6) | $ (1.8) |
Forecast | Accounting Standards Update 2018-11 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use assets |  |  | $ 50.0
Lease liabilities |  |  | $ 60.0

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