Other Income and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Income and Expenses [Abstract]
Investment Income, Interest and Dividend	$ 11.6	$ 4.6	$ 33.8	$ 6.4
Other Nonoperating Income (Expense)	1.5	0.3	3.3	0.4
Nonoperating (loss) Income	$ 13.1	$ 4.9	$ 37.1	$ 6.8