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Income taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Income tax expense (benefit) $ (14,800,000) $ 17,200,000  
Pre-tax income (loss) $ (136,100,000) $ 121,300,000  
Effective tax rate (as a percent) 10.90% 14.20%  
Statutory tax rate (as a percent) 21.40% 21.40%  
Tax Cuts and Jobs Act of 2017, BEAT tax rate, 2019-2025 (as a percent) 10.00%    
Tax Cuts and Jobs Act of 2017, BEAT tax rate, 2026 and thereafter (as a percent) 12.50%    
Provision for income taxes related to BEAT $ 0   $ 0
Provision for income taxes related to GILTI $ 0   $ 0