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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other comprehensive income/(loss), tax (benefit) expense | $ (6.7) | $ 11.5 | $ 20.2
ASU 2019-04 [Member] |  |  |
Increase in accumulated comprehensive income | $ 17.9 |  |

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