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Leases - Lease Balances Within Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
ASSETS:    
Operating lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Operating lease ROU assets $ 265.0 $ 266.9
LIABILITIES:    
Operating lease, liability, current, statement of financial position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Current operating lease liabilities $ 65.1 $ 56.8
Operating lease, liability, noncurrent, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities $ 219.2 $ 220.0
Total operating lease liabilities $ 284.3 $ 276.8