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Basis of Presentation and Responsibility for Interim Financial Statements - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Liability, Current | $ 19.8 |  | $ 19.8 |  | $ 0.0
Operating Lease, Liability, Noncurrent | 62.1 |  | 62.1 |  | 0.0
Net periodic benefit cost | (10.5) | $ 1.8 | (8.8) | $ 3.6 |
Operating Lease, Right-of-Use Asset | $ 78.7 |  | $ 78.7 |  | $ 0.0

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