Accumulated other comprehensive income (loss) - Amounts in OCI (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
Mar. 31, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
$ 82.2
|
|
$ (70.5)
|
|
$ 118.5
|
$ (74.8)
|
| Amounts Arising During the Current Period, Income Tax |
8.2
|
|
(2.0)
|
|
11.9
|
(9.5)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
2.4
|
|
(4.5)
|
|
0.1
|
(8.5)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.4
|
|
1.1
|
|
1.2
|
2.1
|
| Other comprehensive income (loss) |
93.2
|
$ 38.5
|
(75.9)
|
$ (14.8)
|
131.7
|
(90.7)
|
| Cost of revenues |
976.7
|
|
937.8
|
|
1,916.2
|
1,865.0
|
| Selling, general and administrative expenses |
184.5
|
|
194.3
|
|
370.8
|
394.9
|
| Interest and other nonoperating expense |
(1.8)
|
|
(12.5)
|
|
(9.7)
|
(25.8)
|
| Interest expense |
60.9
|
|
56.5
|
|
118.4
|
112.3
|
| AOCI Attributable to Parent |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
78.3
|
|
(69.6)
|
|
113.9
|
(72.1)
|
| Amounts Arising During the Current Period, Income Tax |
8.2
|
|
(2.0)
|
|
11.9
|
(9.5)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
2.4
|
|
(4.5)
|
|
0.1
|
(8.5)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.4
|
|
1.1
|
|
1.2
|
2.1
|
| Other comprehensive income (loss) |
89.3
|
$ 37.8
|
(75.0)
|
$ (13.0)
|
127.1
|
(88.0)
|
| Benefit plan adjustments |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(4.4)
|
|
(6.8)
|
|
(7.8)
|
(7.5)
|
| Amounts Arising During the Current Period, Income Tax |
1.3
|
|
1.4
|
|
2.2
|
1.5
|
| Amounts Reclassified to Net Income (Loss), Pretax |
1.6
|
|
1.4
|
|
2.8
|
3.5
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
(0.4)
|
|
(0.3)
|
|
(0.7)
|
(0.8)
|
| Other comprehensive income (loss) |
(1.9)
|
|
(4.3)
|
|
(3.5)
|
(3.3)
|
| Foreign currency translation adjustments |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
84.8
|
|
(69.0)
|
|
123.5
|
(87.6)
|
| Amounts Arising During the Current Period, Income Tax |
8.0
|
|
(1.6)
|
|
10.9
|
(3.8)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
(1.2)
|
|
(1.2)
|
|
(2.4)
|
(2.3)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.3
|
|
0.2
|
|
0.6
|
0.5
|
| Other comprehensive income (loss) |
91.9
|
|
(71.6)
|
|
132.6
|
(93.2)
|
| Gains (losses) on available-for-sale securities |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(1.8)
|
|
0.6
|
|
(1.4)
|
1.7
|
| Amounts Arising During the Current Period, Income Tax |
(1.2)
|
|
(0.4)
|
|
(1.3)
|
(2.3)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
4.1
|
|
0.0
|
|
4.3
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.0
|
|
0.0
|
|
0.2
|
0.0
|
| Other comprehensive income (loss) |
1.1
|
|
0.2
|
|
1.8
|
(0.6)
|
| Gains (Losses) on Cash Flow Hedges |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(0.3)
|
|
5.6
|
|
(0.4)
|
21.3
|
| Amounts Arising During the Current Period, Income Tax |
0.1
|
|
(1.4)
|
|
0.1
|
(4.9)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
(2.1)
|
|
(4.7)
|
|
(4.6)
|
(9.7)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.5
|
|
1.2
|
|
1.1
|
2.4
|
| Other comprehensive income (loss) |
(1.8)
|
|
0.7
|
|
(3.8)
|
9.1
|
| Gains (Losses) on Cash Flow Hedges | Reclassification out of accumulated other comprehensive income |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Interest expense |
(2.1)
|
|
(4.7)
|
|
(4.6)
|
(9.7)
|
| AOCI Attributable to Noncontrolling Interest |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
3.9
|
|
(0.9)
|
|
4.6
|
(2.7)
|
| Amounts Arising During the Current Period, Income Tax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Pretax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Other comprehensive income (loss) |
3.9
|
|
(0.9)
|
|
4.6
|
(2.7)
|
| Foreign currency translation adjustments |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
3.9
|
|
(0.9)
|
|
4.6
|
(2.7)
|
| Amounts Arising During the Current Period, Income Tax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Pretax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.0
|
|
0.0
|
|
0.0
|
0.0
|
| Other comprehensive income (loss) |
3.9
|
|
(0.9)
|
|
4.6
|
(2.7)
|
| Benefit plan adjustments |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(4.4)
|
|
(6.8)
|
|
(7.8)
|
(7.5)
|
| Amounts Arising During the Current Period, Income Tax |
1.3
|
|
1.4
|
|
2.2
|
1.5
|
| Amounts Reclassified to Net Income (Loss), Pretax |
1.6
|
|
1.4
|
|
2.8
|
3.5
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
(0.4)
|
|
(0.3)
|
|
(0.7)
|
(0.8)
|
| Other comprehensive income (loss) |
(1.9)
|
|
(4.3)
|
|
(3.5)
|
(3.3)
|
| Benefit plan adjustments | Reclassification out of accumulated other comprehensive income |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Cost of revenues |
1.7
|
|
1.7
|
|
3.3
|
3.4
|
| Selling, general and administrative expenses |
0.5
|
|
0.5
|
|
1.0
|
1.1
|
| Interest and other nonoperating expense |
0.7
|
|
0.3
|
|
0.8
|
1.4
|
| Foreign currency translation adjustments |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
88.7
|
|
(69.9)
|
|
128.1
|
(90.3)
|
| Amounts Arising During the Current Period, Income Tax |
8.0
|
|
(1.6)
|
|
10.9
|
(3.8)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
(1.2)
|
|
(1.2)
|
|
(2.4)
|
(2.3)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.3
|
|
0.2
|
|
0.6
|
0.5
|
| Other comprehensive income (loss) |
95.8
|
|
(72.5)
|
|
137.2
|
(95.9)
|
| Gains (losses) on available-for-sale securities |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(1.8)
|
|
0.6
|
|
(1.4)
|
1.7
|
| Amounts Arising During the Current Period, Income Tax |
(1.2)
|
|
(0.4)
|
|
(1.3)
|
(2.3)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
4.1
|
|
0.0
|
|
4.3
|
0.0
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.0
|
|
0.0
|
|
0.2
|
0.0
|
| Other comprehensive income (loss) |
1.1
|
|
0.2
|
|
1.8
|
(0.6)
|
| Gains (losses) on cash flow hedges |
|
|
|
|
|
|
| Other Comprehensive Income Loss [Line Items] |
|
|
|
|
|
|
| Amounts Arising During the Current Period, Pretax |
(0.3)
|
|
5.6
|
|
(0.4)
|
21.3
|
| Amounts Arising During the Current Period, Income Tax |
0.1
|
|
(1.4)
|
|
0.1
|
(4.9)
|
| Amounts Reclassified to Net Income (Loss), Pretax |
(2.1)
|
|
(4.7)
|
|
(4.6)
|
(9.7)
|
| Amounts Reclassified to Net Income (Loss), Income Tax |
0.5
|
|
1.2
|
|
1.1
|
2.4
|
| Other comprehensive income (loss) |
$ (1.8)
|
|
$ 0.7
|
|
$ (3.8)
|
$ 9.1
|