Accounting Changes and Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	$ 22,573.4	$ 25,598.0	$ 13,298.4	$ 13,198.6
Accumulated earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	$ 19,617.7	$ 18,144.5	$ 4,692.1	6,350.4
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment				(30.1)
Adjustment | Accumulated earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment				$ (30.3)