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Leases - ROU (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
ROUA $ 24.9 $ 25.2
ROUA [extensible list] us-gaap:OtherAssetsCurrent us-gaap:OtherAssetsCurrent
ROUL - current $ 1.6 $ 2.8
ROUL - current [extensible list] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
ROUL - non-current $ 24.3 $ 22.8
ROUL $ 25.9 $ 25.6