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Accumulated other comprehensive income (loss) - Amounts in OCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax $ 12.1     $ (4.5)     $ 130.6 $ (79.3)
Amounts Arising During the Current Period, Income Tax (3.0)     9.6     8.9 0.1
Amounts Reclassified to Net Income (Loss), Pretax (2.8)     (8.7)     (2.7) (17.2)
Amounts Reclassified to Net Income (Loss), Income Tax 0.2     0.9     1.4 3.0
Other comprehensive income (loss) 6.5 $ 93.2 $ 38.5 (2.7) $ (75.9) $ (14.8) 138.2 (93.4)
Cost of revenues 990.4     943.6     2,906.6 2,808.6
Selling, general and administrative expenses 199.0     202.3     569.8 597.2
Interest and other nonoperating expense (1.5)     (10.5)     (11.2) (36.3)
Interest expense 63.4     63.0     181.8 175.3
AOCI Attributable to Parent                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 12.7     (11.5)     126.6 (83.6)
Amounts Arising During the Current Period, Income Tax (3.0)     9.6     8.9 0.1
Amounts Reclassified to Net Income (Loss), Pretax (2.8)     (8.7)     (2.7) (17.2)
Amounts Reclassified to Net Income (Loss), Income Tax 0.2     0.9     1.4 3.0
Other comprehensive income (loss) 7.1 $ 89.3 $ 37.8 (9.7) $ (75.0) $ (13.0) 134.2 (97.7)
Benefit plan adjustments                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax (1.4)     (2.1)     (9.2) (9.6)
Amounts Arising During the Current Period, Income Tax 0.3     0.6     2.5 2.1
Amounts Reclassified to Net Income (Loss), Pretax 1.2     1.5     4.0 5.0
Amounts Reclassified to Net Income (Loss), Income Tax (0.3)     (0.4)     (1.0) (1.2)
Other comprehensive income (loss) (0.2)     (0.4)     (3.7) (3.7)
Foreign currency translation adjustments                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 11.2     9.2     134.7 (78.4)
Amounts Arising During the Current Period, Income Tax (0.9)     3.2     10.0 (0.6)
Amounts Reclassified to Net Income (Loss), Pretax (1.2)     (1.1)     (3.6) (3.4)
Amounts Reclassified to Net Income (Loss), Income Tax 0.2     0.3     0.8 0.8
Other comprehensive income (loss) 9.3     11.6     141.9 (81.6)
Gains (losses) on available-for-sale securities                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 2.8     (1.6)     1.4 0.1
Amounts Arising During the Current Period, Income Tax (2.4)     1.8     (3.7) (0.5)
Amounts Reclassified to Net Income (Loss), Pretax (1.1)     (4.5)     3.2 (4.5)
Amounts Reclassified to Net Income (Loss), Income Tax (0.1)     0.0     0.1 0.0
Other comprehensive income (loss) (0.8)     (4.3)     1.0 (4.9)
Gains (Losses) on Cash Flow Hedges                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 0.1     (17.0)     (0.3) 4.3
Amounts Arising During the Current Period, Income Tax 0.0     4.0     0.1 (0.9)
Amounts Reclassified to Net Income (Loss), Pretax (1.7)     (4.6)     (6.3) (14.3)
Amounts Reclassified to Net Income (Loss), Income Tax 0.4     1.0     1.5 3.4
Other comprehensive income (loss) (1.2)     (16.6)     (5.0) (7.5)
Gains (Losses) on Cash Flow Hedges | Reclassification out of accumulated other comprehensive income                
Other Comprehensive Income Loss [Line Items]                
Interest expense (1.7)     (4.6)     (6.3) (14.3)
AOCI Attributable to Noncontrolling Interest                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax (0.6)     7.0     4.0 4.3
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) (0.6)     7.0     4.0 4.3
Foreign currency translation adjustments                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax (0.6)     7.0     4.0 4.3
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) (0.6)     7.0     4.0 4.3
Benefit plan adjustments                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax (1.4)     (2.1)     (9.2) (9.6)
Amounts Arising During the Current Period, Income Tax 0.3     0.6     2.5 2.1
Amounts Reclassified to Net Income (Loss), Pretax 1.2     1.5     4.0 5.0
Amounts Reclassified to Net Income (Loss), Income Tax (0.3)     (0.4)     (1.0) (1.2)
Other comprehensive income (loss) (0.2)     (0.4)     (3.7) (3.7)
Benefit plan adjustments | Reclassification out of accumulated other comprehensive income                
Other Comprehensive Income Loss [Line Items]                
Cost of revenues 1.7     1.7     5.0 5.1
Selling, general and administrative expenses 0.4     0.5     1.4 1.6
Interest and other nonoperating expense 0.7     (0.5)     1.5 0.9
Foreign currency translation adjustments                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 10.6     16.2     138.7 (74.1)
Amounts Arising During the Current Period, Income Tax (0.9)     3.2     10.0 (0.6)
Amounts Reclassified to Net Income (Loss), Pretax (1.2)     (1.1)     (3.6) (3.4)
Amounts Reclassified to Net Income (Loss), Income Tax 0.2     0.3     0.8 0.8
Other comprehensive income (loss) 8.7     18.6     145.9 (77.3)
Gains (losses) on available-for-sale securities                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 2.8     (1.6)     1.4 0.1
Amounts Arising During the Current Period, Income Tax (2.4)     1.8     (3.7) (0.5)
Amounts Reclassified to Net Income (Loss), Pretax (1.1)     (4.5)     3.2 (4.5)
Amounts Reclassified to Net Income (Loss), Income Tax (0.1)     0.0     0.1 0.0
Other comprehensive income (loss) (0.8)     (4.3)     1.0 (4.9)
Gains (losses) on cash flow hedges                
Other Comprehensive Income Loss [Line Items]                
Amounts Arising During the Current Period, Pretax 0.1     (17.0)     (0.3) 4.3
Amounts Arising During the Current Period, Income Tax 0.0     4.0     0.1 (0.9)
Amounts Reclassified to Net Income (Loss), Pretax (1.7)     (4.6)     (6.3) (14.3)
Amounts Reclassified to Net Income (Loss), Income Tax 0.4     1.0     1.5 3.4
Other comprehensive income (loss) $ (1.2)     $ (16.6)     $ (5.0) $ (7.5)