Other–Net, (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Nonoperating Income (Expense) [Abstract]
Interest expense	$ 120.3	$ 81.2	$ 223.1	$ 166.1
Interest income	(46.0)	(10.2)	(80.2)	(17.2)
Net investment losses on equity securities (Note 5)	64.9	118.9	78.6	544.3
Retirement benefit plans	(115.6)	(94.3)	(231.4)	(187.6)
Other (income) expense	13.2	23.6	11.0	(35.7)
Other–net, (income) expense	$ 36.8	$ 119.2	$ 1.1	$ 469.9