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Leases - Future minimum lease payments under non-cancellable leases (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Operating Leases    
Remaining 2019 $ 4.1  
2020 16.9  
2021 17.1  
2022 6.3  
2023 4.4  
Thereafter 5.4  
Total future lease cost 54.2  
Less: Amount representing interest (4.9)  
Present value of future payments 49.3 $ 40.4
Less: Short-term leases not recorded as a liability (0.2)  
Revised present value of future lease payments 49.1  
Less: Current portion (14.8)  
Long-term portion 34.3  
Finance Leases    
Remaining 2019 0.3  
2020 1.3  
2021 1.3  
2022 1.4  
2023 1.4  
Thereafter 15.3  
Total future lease cost 21.0  
Less: Amount representing interest (5.9)  
Present value of future payments 15.1 $ 15.9
Less: Short-term leases not recorded as a liability 0.0  
Revised present value of future lease payments 15.1  
Less: Current portion (0.6)  
Long-term portion $ 14.5