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Recent Accounting Pronouncements Adoption of ASU 2016-02 Leases - Impact of Adoption (Details) - Adjustments for New Accounting Pronouncement [Member] - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2018
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Other Noncurrent Assets [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Balance as of December 31, 2018 - Prior to Adoption of ASU 2016-02 |  | $ (196.8)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 80.0 |
Balance as of January 1, 2019 - Subsequent to Adoption of ASU 2016-02 | (276.8) |
Accrued Liabilities [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Balance as of December 31, 2018 - Prior to Adoption of ASU 2016-02 |  | 416.7
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (18.7) |
Balance as of January 1, 2019 - Subsequent to Adoption of ASU 2016-02 | 435.4 |
Other Noncurrent Liabilities [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Balance as of December 31, 2018 - Prior to Adoption of ASU 2016-02 |  | $ 166.5
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (61.3) |
Balance as of January 1, 2019 - Subsequent to Adoption of ASU 2016-02 | $ 227.8 |

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