Employee Retirement Plans and Postretirement Benefits - Level 3 Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total gain or loss (realized/unrealized):
Prior year fair value of assets	$ 5,667.5	$ 5,958.4
Foreign exchange translation (loss)/gain	(333.2)	(20.5)
Fair value of plan assets at end of year	3,336.8	5,667.5
Significant unobservable inputs (Level 3)
Total gain or loss (realized/unrealized):
Prior year fair value of assets	754.5	856.3
Realized gain (loss)	(1.9)	0.9
Unrealized gain (loss) included in AOCI	(183.5)	(63.3)
Purchases, issuances, settlements	(6.6)	(32.8)
Foreign exchange translation (loss)/gain	(75.5)	(6.6)
Fair value of plan assets at end of year	$ 487.0	$ 754.5