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Summary of Accounting Policies Summary of Accounting Policies - Effects of Adopting ASC 842 (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other current assets | $ 76.7 | $ 75.3
Other long-term assets | 103.6 | 22.9
Accrued liabilities and other |  | 258.0
Other long-term liabilities | $ 392.4 | 266.5
Balances Without Adoption of ASC 842 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other current assets |  | 74.8
Other long-term assets |  | 92.5
Accrued liabilities and other |  | 279.4
Other long-term liabilities |  | 314.2
Effect of Change Higher/(Lower) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other current assets |  | (0.5)
Other long-term assets |  | 69.6
Accrued liabilities and other |  | 21.4
Other long-term liabilities |  | $ 47.7

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