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Retirement and Deferred Compensation Plans - Schedule of Changes in Fair Value of Pension Assets Measured Using Level 3 Inputs (Details) - Pension plans - Common contractual funds and insurance contracts - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | $ 153.9 | $ 108.8
Actual return on plan assets | 30.5 | 4.2
Acquisitions | 27.6 |
Transfers |  | 46.2
Purchases, sales and settlements, net | 2.5 | (0.3)
Currency exchange rate changes | 0.3 | (5.0)
Fair value of plan assets, end of year | $ 214.8 | $ 153.9

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