Benefit Plans and Other Postretirement Benefits, Level 3 plan assets (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Fair value of plan assets at the beginning of the year	$ 470.6	$ 644.0
Foreign currency translation	(3.0)	(9.2)
Fair value of plan assets at end of year	481.6	470.6
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure
Fair value of plan assets at the beginning of the year	24.3	34.1
Unrealized gains (losses), net	1.6	(6.2)
Purchases, sales and settlements, net	(7.2)	(1.3)
Foreign currency translation	0.8	(2.3)
Fair value of plan assets at end of year	$ 19.5	$ 24.3