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Supplemental Disclosure of Noncash Investing and Financing Activities Statement - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Supplemental Disclosure of Noncash Investing and Financing Activities [Abstract]    
Noncash or Part Noncash Acquisition, Investments Acquired $ 3.1 $ 11.9
Noncash or Part Noncash Acquisition, Net Unsettled Security Trades 1.8 $ 5.0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 12.0