Pension and Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) - Pension plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 528.7	$ 815.6
Foreign currency exchange rate changes	26.7	(76.1)
Fair value of plan assets at end of year	572.0	528.7
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	40.2	43.7
Actual return on plan assets related to assets still held at reporting date	2.6	(0.9)
Purchases, sales and /or settlements	(3.0)	(0.2)
Foreign currency exchange rate changes	1.2	(2.4)
Fair value of plan assets at end of year	41.0	40.2
Level 3 | Alternative Investments
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2.4	3.5
Actual return on plan assets related to assets still held at reporting date	(0.2)	(1.1)
Purchases, sales and /or settlements	0.0	0.0
Foreign currency exchange rate changes	0.0	0.0
Fair value of plan assets at end of year	2.2	2.4
Level 3 | Miscellaneous Funds
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	37.8	40.2
Actual return on plan assets related to assets still held at reporting date	2.8	0.2
Purchases, sales and /or settlements	(3.0)	(0.2)
Foreign currency exchange rate changes	1.2	(2.4)
Fair value of plan assets at end of year	$ 38.8	$ 37.8