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Financial Instruments (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Derivative Financial Instruments |  |
Investment grade bonds | $ 10.2 | $ 0.0
Cash |  |
Derivative Financial Instruments |  |
Deferred compensation, Rabbi Trust | 5.9 | 6.6
Short-term Investments |  |
Derivative Financial Instruments |  |
Deferred compensation, Rabbi Trust | 7.7 | 7.7
Foreign Exchange Forward | Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Fair value | 1.7 | 5.0
Notional amount | $ 122.6 | 93.5
Foreign Exchange Forward | Designated as Hedging Instrument | Cash Flow Hedging | Maximum |  |
Derivative Financial Instruments |  |
Maturity term | 15 months |
Foreign Exchange Forward | Not Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Fair value | $ 0.2 | 0.2
Notional amount | $ 131.7 | $ 63.7
Foreign Exchange Forward | Not Designated as Hedging Instrument | Maximum |  |
Derivative Financial Instruments |  |
Maturity term | 1 year |

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