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Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Changes in the components of AOCI |  |  |  |  |  |  |  |
Beginning balance | $ 6,968.5 | $ 6,831.3 | $ 6,513.6 | $ 6,103.1 | $ 5,977.9 | $ 5,894.8 | $ 6,513.6 | $ 5,894.8
Net other comprehensive loss | (2.0) | 1.6 | (0.3) | (5.9) | 5.0 | 4.0 | (0.7) | 3.1
Ending balance | 7,080.2 | 6,968.5 | 6,831.3 | 6,311.6 | 6,103.1 | 5,977.9 | 7,080.2 | 6,311.6
Total |  |  |  |  |  |  |  |
Changes in the components of AOCI |  |  |  |  |  |  |  |
Beginning balance | (2.8) | (4.4) | (4.1) | (11.6) | (16.6) | (20.6) | (4.1) | (20.6)
Net other comprehensive loss | (2.0) | 1.6 | (0.3) | (5.9) | 5.0 | 4.0 | (0.7) |
Ending balance | (4.8) | $ (2.8) | (4.4) | $ (17.5) | $ (11.6) | $ (16.6) | (4.8) | $ (17.5)
Minimum Pension Liability |  |  |  |  |  |  |  |
Changes in the components of AOCI |  |  |  |  |  |  |  |
Beginning balance |  |  | 11.0 |  |  |  | 11.0 |
Net other comprehensive loss |  |  |  |  |  |  | (0.7) |
Ending balance | 10.3 |  |  |  |  |  | 10.3 |
Foreign Currency |  |  |  |  |  |  |  |
Changes in the components of AOCI |  |  |  |  |  |  |  |
Beginning balance |  |  | $ (15.1) |  |  |  | (15.1) |
Net other comprehensive loss |  |  |  |  |  |  | 0.0 |
Ending balance | $ (15.1) |  |  |  |  |  | $ (15.1) |

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