v3.25.4
Income taxes - rate reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount reconciliation      
(Loss) income before income taxes $ (441.3) $ 853.9 $ 410.5
United States federal corporate rate (92.7) 179.3 86.2
State and Local Income Taxes, Net of Federal Income Tax Effect1 (8.6) 24.3 27.3
German Trade Tax 2.9 1.9 5.5
Other Adjustments 3.2 (4.9) 3.1
FDII (14.4) (13.9) (17.1)
GILTI (0.1) 8.0 (0.1)
Other Effect of Cross-Border Tax Laws 1.7 1.2 0.0
Research and development tax credits (1.4) (2.1) (1.9)
Executive Compensation Limitation 4.7 2.2 6.1
Impairment of Goodwill 164.9 0.0 0.0
Other Permanent differences 6.1 6.2 1.7
Changes in Unrecognized Tax Benefits 17.0 (22.7) (0.3)
Income tax benefit $ 88.9 $ 142.4 $ 89.4
Percent reconciliation [Abstract]      
United States federal corporate rate 21.00% 21.00% 21.00%
State and Local Income Taxes, Net of Federal Income Tax Effect1 1.90% 2.90% 6.70%
German Trade Tax (0.70%) 0.20% 1.30%
Other adjustments (0.70%) (0.50%) 0.80%
FDII 3.30% (1.60%) (4.20%)
GILTI 0.00% 0.90% 0.00%
Other Effect of Cross-Border Tax Laws (0.40%) 0.10% 0.00%
Research and development tax credits 0.30% (0.20%) (0.50%)
Executive Compensation Limitation (1.10%) 0.30% 1.50%
Impairment of Goodwill (37.40%) 0.00% 0.00%
Other Permanent differences (1.30%) 0.70% 0.40%
Changes in Unrecognized Tax Benefits (3.80%) (2.80%) (0.10%)
Income tax benefit (20.10%) 16.70% 21.80%
Germany      
Amount reconciliation      
Statutory tax rate difference between foreign countries and United States $ (7.5) $ (9.1) $ (21.1)
Valuation Allowance 16.0 22.5 24.6
Other Adjustments $ (1.0) $ (1.7) $ (1.6)
Percent reconciliation [Abstract]      
Statutory tax rate difference between foreign countries and United States 1.70% (1.10%) (5.10%)
Valuation Allowance (3.60%) 2.60% 6.00%
Other adjustments 0.20% (0.10%) (0.40%)
NETHERLANDS      
Amount reconciliation      
Valuation Allowance $ (9.5) $ 0.0 $ 0.0
Other Adjustments $ 2.3 $ 2.0 $ (6.9)
Percent reconciliation [Abstract]      
Valuation Allowance 2.10% 0.00% 0.00%
Other adjustments (0.50%) 0.20% (1.70%)
Singapore      
Amount reconciliation      
Other Adjustments $ 0.2 $ (3.4) $ (3.3)
Tax Exempt Income $ 0.0 $ (14.5) $ (14.7)
Percent reconciliation [Abstract]      
Other adjustments 0.00% (0.40%) (0.80%)
Tax Exempt Income 0.00% (1.70%) (3.60%)
SWITZERLAND      
Amount reconciliation      
Statutory tax rate difference between foreign countries and United States $ 15.6 $ 0.0 $ 0.3
Other Adjustments $ (3.2) $ 3.1 $ (0.6)
Percent reconciliation [Abstract]      
Statutory tax rate difference between foreign countries and United States (3.50%) 0.00% 0.10%
Other adjustments 0.70% 0.40% (0.10%)
UNITED KINGDOM      
Amount reconciliation      
Other Adjustments $ 4.4 $ 4.3 $ (2.3)
Tax Exempt Income (19.2) (0.6) 0.0
Clinical Services Sale $ 0.0 $ (38.5) $ 0.0
Percent reconciliation [Abstract]      
Other adjustments (1.00%) 0.50% (0.60%)
Tax Exempt Income 4.40% (0.10%) 0.00%
Clinical Services Sale 0.00% (4.50%) 0.00%
Foreign Tax Jurisdiction, Other      
Amount reconciliation      
Statutory tax rate difference between foreign countries and United States $ 7.5 $ (1.2) $ 4.5
Percent reconciliation [Abstract]      
Statutory tax rate difference between foreign countries and United States (1.70%) (0.10%) 1.10%