Pension and Postretirement Benefits (Summary of Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	$ 67.7	$ 99.5
Service cost	1.9	2.1	$ 2.6
Interest cost	2.1	0.9	0.7
Plan participants’ contributions	0.4	0.4
Actuarial loss (gain)	7.4	(24.3)
Settlements	(3.7)	(2.2)
Benefits paid	(4.1)	(3.0)
Foreign currency exchange and other	6.0	(5.5)
Administrative expenses paid	(0.1)	(0.2)
Benefit obligation at end of year	77.6	67.7	99.5
Change in plan assets:
Fair value of plan assets at beginning of year	79.2	105.4
Actual return on plan assets	4.8	(16.7)
Employer contributions	1.8	1.9
Plan participants’ contributions	0.4	0.4
Settlements	(3.7)	(2.2)
Benefits paid	(4.1)	(3.0)
Foreign currency exchange and other	5.5	(6.3)
Administrative expenses paid	(0.4)	(0.3)
Fair value of plan assets at end of year	83.5	79.2	105.4
Funded status	5.9	11.5
Postretirement Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	16.3	23.4
Service cost	0.1	0.1	0.2
Interest cost	0.8	0.6	0.6
Plan participants’ contributions	0.0	0.0
Actuarial loss (gain)	(2.9)	(6.4)
Settlements	0.0	0.0
Benefits paid	(1.6)	(1.4)
Foreign currency exchange and other	0.0	0.0
Administrative expenses paid	0.0	0.0
Benefit obligation at end of year	12.7	16.3	23.4
Change in plan assets:
Fair value of plan assets at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	1.6	1.4
Plan participants’ contributions	0.0	0.0
Settlements	0.0	0.0
Benefits paid	(1.6)	(1.4)
Foreign currency exchange and other	0.0	0.0
Administrative expenses paid	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0	$ 0.0
Funded status	$ (12.7)	$ (16.3)