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Accounting Pronouncements New Accounting Pronouncement (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset $ 40.9 [1] $ 34.5
Operating Lease, Liability $ 45.8 [2] $ 39.1
[1] Included in Property, Plant and Equipment in the 2019 Consolidated Balance Sheet.
[2] Included in Other Deferred Credits and Other Liabilities in the 2019 Consolidated Balance Sheet.