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Debt - Aggregate Annual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Aggregate annual maturities of debt    
2019 $ 41.1  
2020 60.6  
2021 424.3  
2022 1.9  
2023 171.4  
Thereafter 1.7  
Total debt $ 701.0 $ 910.2