Financial Information and Accounting Policies - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards	$ 3,203.6	$ 3,219.1	$ 3,174.0	$ 3,143.7	$ 3,154.0	$ 3,232.1	$ 3,130.3	$ 2,984.2
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards	5,354.8	5,300.7	5,233.4	5,092.9	4,968.9	4,870.1	4,727.4	4,506.4
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards	$ (542.0)	$ (470.2)	$ (445.4)	$ (325.5)	$ (291.2)	$ (308.7)	$ (284.2)	(282.2)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards								100.0
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards								98.5
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards								$ 1.5