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Supplemental Balance Sheet Data - Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Deferred Purchase Price $ 0.7 $ 66.9
Prepaid Assets 39.0 24.7
Contract Assets, current portion 10.4 9.8
Fair Value of Derivatives, current portion 0.0 0.7
Total $ 50.1 $ 102.1