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Derivative Instruments (Details) $ in Millions |  |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Jun. 16, 2021 USD ($) | May 27, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2011 USD ($) instrument
Derivative [Line Items] |  |  |  |  |  |
Amortization of interest expense |  |  | $ 1.7 | $ 1.7 | $ 1.4 |
Non-cash interest expense associated with forward starting swaps |  |  | $ 3.3 | $ 6.0 | $ 6.3 |
Senior Notes | 4.50% Senior Notes, due December 2020 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  | 4.50% |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  | $ (1.4) |  |  |  |
Senior Notes | 4.20% Senior Notes, repaid in June 2021 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  | 4.20% |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate | $ (1.3) |  |  |  |  |
Interest Rate Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, number of instruments held | instrument |  |  |  |  |  | 2
Interest Rate Exchange Agreement Expiring Two Thousand Ten and Eleven |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amortization of interest expense |  |  |  |  |  | $ 68.9
Term of amortized interest expense, years |  |  |  |  |  | 10 years

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