Pension and Postretirement Benefit Plans (Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized in Consolidated Balance Sheets:
Pensions and postretirement health care benefits (noncurrent)	$ (170.5)	$ (158.0)
Pension and ENPP Benefits
Change in benefit obligation
Benefit obligation at beginning of year	611.6	904.8
Service cost	9.6	12.8	$ 15.0
Interest cost	29.3	14.8	12.6
Plan participants’ contributions	1.3	1.2
Actuarial losses (gains)	21.6	(227.2)
Amendments	0.1	25.5
Settlements	(4.9)	(5.0)
Benefits paid	(46.1)	(44.0)
Foreign currency exchange rate changes	24.5	(71.3)
Benefit obligation at end of year	647.0	611.6	904.8
Change in plan assets
Fair value of plan assets at beginning of year	528.7	815.6
Actual return on plan assets	31.2	(197.1)
Employer contributions	35.1	34.1
Plan participants’ contributions	1.3	1.2
Benefits paid	(46.1)	(44.0)
Settlements	(4.9)	(5.0)
Foreign currency exchange rate changes	26.7	(76.1)
Fair value of plan assets at end of year	572.0	528.7	815.6
Funded status	(75.0)	(82.9)
Amounts recognized in Consolidated Balance Sheets:
Other long-term asset	85.0	66.3
Other current liabilities	(7.4)	(7.0)
Accrued expenses	(4.1)	(3.8)
Pensions and postretirement health care benefits (noncurrent)	(148.5)	(138.4)
Net amount recognized	(75.0)	(82.9)
Postretirement Benefits
Change in benefit obligation
Benefit obligation at beginning of year	21.2	22.6
Service cost	0.1	0.1	0.1
Interest cost	1.3	0.9	0.9
Plan participants’ contributions	0.0	0.0
Actuarial losses (gains)	1.7	(0.9)
Amendments	0.0	0.0
Settlements	0.0	0.0
Benefits paid	(1.8)	(1.7)
Foreign currency exchange rate changes	0.5	0.2
Benefit obligation at end of year	23.0	21.2	22.6
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	1.8	1.7
Plan participants’ contributions	0.0	0.0
Benefits paid	(1.8)	(1.7)
Settlements	0.0	0.0
Foreign currency exchange rate changes	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0	$ 0.0
Funded status	(23.0)	(21.2)
Amounts recognized in Consolidated Balance Sheets:
Other long-term asset	0.0	0.0
Other current liabilities	(1.6)	(1.6)
Accrued expenses	0.0	0.0
Pensions and postretirement health care benefits (noncurrent)	(21.4)	(19.6)
Net amount recognized	$ (23.0)	$ (21.2)