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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income taxes          
Income tax expense (benefit) $ (6.9) $ (12.8) $ 55.4 $ (11.3)  
Pre-tax income (loss) $ (34.6) $ (185.1) $ 169.2 $ (166.7)  
Effective tax rate (as a percent)     32.70% 6.80%  
Statutory tax rate (as a percent)     22.00% 22.00% 21.00%
Tax Cuts and Jobs Act of 2017, BEAT tax rate, 2018 (as a percent)     5.00%    
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   $ 0.0
Provision for income taxes related to GILTI     $ 0.0   $ 0.0
Remeasurement period for transition tax (in years)     1 year