Employee Benefit Plans (Change in Accumulated Income (Loss) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net change	$ (18.7)	$ 279.1	$ 73.9
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unrecognized actuarial loss (gain)	8.3
Amortization of actuarial gain	20.5
Unrecognized prior service cost	(16.3)
Amortization of prior service (credit) cost	(1.0)
Impact of foreign currency translation	(2.9)
Net change	41.2
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unrecognized actuarial loss (gain)	(22.8)
Amortization of actuarial gain	1.4
Unrecognized prior service cost	0.0
Amortization of prior service (credit) cost	0.7
Impact of foreign currency translation	0.0
Net change	$ (20.7)