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New Accounting Standards (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 1,846.7   $ 1,549.4
Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   $ 0.1