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Leases - Future minimum lease payments under non-cancellable leases (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
2019 $ 8.3    
2020 16.8    
2021 16.9    
2022 6.0    
2023 4.2    
Thereafter 5.0    
Total future lease cost 57.2    
Less: Amount representing interest (5.4)    
Present value of future payments 51.8 $ 40.4  
Less: Short-term leases not recorded as a liability (0.5)    
Revised present value of future lease payments 51.3    
Less: Current portion (14.1)   $ 0.0
Long-term portion 37.2   $ 0.0
Finance Leases      
2019 0.6    
2020 1.3    
2021 1.3    
2022 1.4    
2023 1.4    
Thereafter 15.3    
Total future lease cost 21.3    
Less: Amount representing interest (6.1)    
Present value of future payments 15.2 $ 15.9  
Less: Short-term leases not recorded as a liability 0.0    
Revised present value of future lease payments 15.2    
Less: Current portion (0.5)    
Long-term portion $ 14.7