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Financial Instruments - Fair Value on a Recurring Basis (Details) - Fair value measured on a recurring basis - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Plan assets for deferred compensation | $ 2.5 | $ 2.5
Total assets | 2.5 | 3.7
Liabilities |  |
Plan liabilities for deferred compensation | 2.5 | 2.5
Derivative liabilities | 0.1 | 0.2
Contingent Consideration | 3.2 |
Total liabilities | 6.4 | 2.7
Interest Rate Swaps |  |
Assets |  |
Derivative outstanding |  | 1.2
Liabilities |  |
Derivative liabilities | 0.6 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Plan assets for deferred compensation | 2.5 | 2.5
Total assets | 2.5 | 2.5
Liabilities |  |
Plan liabilities for deferred compensation | 2.5 | 2.5
Total liabilities | 2.5 | 2.5
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total assets |  | 1.2
Liabilities |  |
Derivative liabilities | 0.1 | 0.2
Total liabilities | 0.7 | 0.2
Significant Other Observable Inputs (Level 2) | Interest Rate Swaps |  |
Assets |  |
Derivative outstanding |  | $ 1.2
Liabilities |  |
Derivative liabilities | 0.6 |
Significant Unobservable Inputs (Level 3) |  |
Liabilities |  |
Contingent Consideration | 3.2 |
Total liabilities | $ 3.2 |

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