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New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  | $ 3,211.5 | $ 2,820.8
Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  | $ 3,211.5 |
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) | $ (1.2) |  |

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