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Leases - Future minimum lease payments under non-cancellable leases (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
2019 $ 11.3    
2020 14.2    
2021 14.5    
2022 3.7    
2023 1.6    
Thereafter 1.0    
Total future lease cost 46.3    
Less: Amount representing interest (3.6)    
Present value of future payments 42.7 $ 40.4  
Less: Short-term leases not recorded as a liability (0.9)    
Revised present value of future lease payments 41.8    
Less: Current portion (12.3)   $ 0.0
Long-term portion 29.5   $ 0.0
Finance Leases      
2019 1.0    
2020 1.3    
2021 1.3    
2022 1.4    
2023 1.4    
Thereafter 15.4    
Total future lease cost 21.8    
Less: Amount representing interest (6.1)    
Present value of future payments 15.7 $ 15.9  
Less: Short-term leases not recorded as a liability 0.0    
Revised present value of future lease payments 15.7    
Less: Current portion (0.5)    
Long-term portion $ 15.2