General (Details) - USD ($) $ in Millions	Jan. 01, 2020	Sep. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Decrease in retained earnings		$ (2,303.7)	$ (2,148.7)
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings	$ 1.3