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Summary of Significant Accounting Policies - Maturities of Lease Liabilities, Topic 842 (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finance Leases    
2019 $ 1.0  
2020 1.7  
2021 1.7  
2022 1.1  
2023 0.1  
Thereafter 0.0  
Total lease payments 5.6  
Less imputed interest 0.2  
Total 5.4 $ 5.8
Operating Leases    
2019 37.0  
2020 67.5  
2021 30.7  
2022 18.4  
2023 11.1  
Thereafter 15.9  
Total lease payments 180.6  
Less imputed interest 17.7  
Total $ 162.9