Employee Benefit Plans Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	$ (383.2)	$ (494.6)
Amortization of Net Actuarial Loss (Gain)	16.3	21.3	$ 18.7
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	87.7	124.8
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.1
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	(25.7)	(34.7)
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	(304.9)	(383.2)	(494.6)
Pension Plan | UNITED KINGDOM
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	(34.0)	(54.7)
Amortization of Net Actuarial Loss (Gain)	0.4	1.3	1.1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(41.2)	26.3
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	10.4	(6.9)
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	(64.4)	(34.0)	(54.7)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	21.2	19.3
Amortization of Net Actuarial Loss (Gain)	(1.0)	0.0	0.0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	19.0	2.6
Amortization of Prior Service Cost (Credit)	(0.2)	(0.2)	(0.2)
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	(3.8)	(0.5)
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	$ 35.2	$ 21.2	$ 19.3