| | | | | | | | | | | | | | | | | |
| | Foreign currency translation adjustments (1) | | Pension liability adjustments, net of taxes | | Accumulated other comprehensive (loss) income |
| Balance at March 31, 2025 | $ | (31.1) | | | $ | (1.2) | | | $ | (32.3) | |
| Other comprehensive income before reclassifications, net of taxes | 281.3 | | | — | | | 281.3 | |
| Amounts reclassified from accumulated other comprehensive loss, net of income taxes | — | | | 0.6 | | | 0.6 | |
| Net current-period other comprehensive income, net of taxes | 281.3 | | | 0.6 | | | 281.9 | |
| Balance at June 30, 2025 | $ | 250.2 | | | $ | (0.6) | | | $ | 249.6 | |
|
| Foreign currency translation adjustments (1) | | Pension liability adjustments, net of taxes | | Accumulated other comprehensive loss |
| Balance at March 31, 2024 | $ | (42.4) | | | $ | (2.5) | | | $ | (44.9) | |
| Other comprehensive loss before reclassifications, net of taxes | (45.1) | | | — | | | (45.1) | |
| Amounts reclassified from accumulated other comprehensive loss, net of taxes | — | | | — | | | — | |
| Net current-period other comprehensive loss, net of taxes | (45.1) | | | — | | | (45.1) | |
| Balance at June 30, 2024 | $ | (87.5) | | | $ | (2.5) | | | $ | (90.0) | |
|
| Foreign currency translation adjustments (1) | | Pension liability adjustments, net of taxes | | Accumulated other comprehensive (loss) income |
| Balance at December 31, 2024 | $ | (153.6) | | | $ | (1.5) | | | $ | (155.1) | |
| Other comprehensive income before reclassifications, net of taxes | 403.8 | | | — | | | 403.8 | |
| Amounts reclassified from accumulated other comprehensive loss, net of taxes | — | | | 0.9 | | | 0.9 | |
| Net current-period other comprehensive income, net of taxes | 403.8 | | | 0.9 | | | 404.7 | |
| Balance at June 30, 2025 | $ | 250.2 | | | $ | (0.6) | | | $ | 249.6 | |
|
| Foreign currency translation adjustments (1) | | Pension liability adjustments, net of taxes | | Accumulated other comprehensive income (loss) |
| Balance at December 31, 2023 | $ | 13.2 | | | $ | (2.4) | | | $ | 10.8 | |
| Other comprehensive loss before reclassifications, net of taxes | (100.7) | | | — | | | (100.7) | |
| Amounts reclassified from accumulated other comprehensive income, net of taxes | — | | | (0.1) | | | (0.1) | |
| Net current-period other comprehensive loss, net of taxes | (100.7) | | | (0.1) | | | (100.8) | |
| Balance at June 30, 2024 | $ | (87.5) | | | $ | (2.5) | | | $ | (90.0) | |