Accumulated other comprehensive income or loss (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Changes in AOCI, net of tax | ||||
| Beginning balance | $ (97.0) | $ (89.7) | $ (69.0) | $ (100.3) |
| Unrealized gain (loss) | (0.9) | 24.7 | (13.3) | 36.6 |
| Reclassification of (gain) loss into earnings | (8.4) | (7.6) | (16.9) | (14.1) |
| Income tax effect | (1.0) | 0.7 | (8.1) | 5.9 |
| Ending balance | (107.3) | (71.9) | (107.3) | (71.9) |
| Foreign currency translation | ||||
| Changes in AOCI, net of tax | ||||
| Beginning balance | (111.7) | (111.7) | (82.8) | (131.3) |
| Unrealized gain (loss) | (6.1) | 8.7 | (28.1) | 25.6 |
| Reclassification of (gain) loss into earnings | 0.0 | 0.0 | 0.0 | 0.0 |
| Income tax effect | (1.7) | 2.6 | (8.6) | 5.3 |
| Ending balance | (119.5) | (100.4) | (119.5) | (100.4) |
| Derivative instruments | ||||
| Changes in AOCI, net of tax | ||||
| Beginning balance | 13.6 | 14.9 | 12.6 | 19.9 |
| Unrealized gain (loss) | 5.4 | 16.8 | 15.2 | 16.7 |
| Reclassification of (gain) loss into earnings | (8.4) | (7.6) | (16.9) | (14.1) |
| Income tax effect | 0.7 | (2.2) | 0.4 | (0.6) |
| Ending balance | 11.3 | 21.9 | 11.3 | 21.9 |
| Defined benefit plans | ||||
| Changes in AOCI, net of tax | ||||
| Beginning balance | 1.1 | 7.1 | 1.2 | 11.1 |
| Unrealized gain (loss) | (0.2) | (0.8) | (0.4) | (5.7) |
| Reclassification of (gain) loss into earnings | 0.0 | 0.0 | 0.0 | 0.0 |
| Income tax effect | 0.0 | 0.3 | 0.1 | 1.2 |
| Ending balance | $ 0.9 | $ 6.6 | $ 0.9 | $ 6.6 |