Employee Benefit Plans Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	$ 8.8	$ 8.4
Noncurrent Pension Liability	268.4	397.4
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	277.2	405.8
Net Actuarial Gain (Loss) in Balance Sheet	(517.8)	(621.8)
Prior Service Credit in Balance Sheet	(0.6)	(0.6)
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(518.4)	(622.4)
Pension Deferred Tax Asset in Balance Sheet	213.5	239.2
Pension Recognized in Balance Sheet, Net of Deferred Tax	(304.9)	(383.2)	$ (494.6)
Pension Plan | UNITED KINGDOM
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	0.0	0.0
Noncurrent Pension Liability	17.4	0.0
Noncurrent Pension Asset	0.0	(25.4)
Funded Status of Plan	17.4	(25.4)
Net Actuarial Gain (Loss) in Balance Sheet	(83.7)	(42.9)
Prior Service Credit in Balance Sheet	(0.2)	(0.2)
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(83.9)	(43.1)
Pension Deferred Tax Asset in Balance Sheet	19.5	9.1
Pension Recognized in Balance Sheet, Net of Deferred Tax	(64.4)	(34.0)	(54.7)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	1.1	1.4
Noncurrent Pension Liability	74.3	99.9
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	75.4	101.3
Net Actuarial Gain (Loss) in Balance Sheet	31.6	13.6
Prior Service Credit in Balance Sheet	2.5	2.7
Pension Recognized in Balance Sheet, Gross of Deferred Tax	34.1	16.3
Pension Deferred Tax Asset in Balance Sheet	1.1	4.9
Pension Recognized in Balance Sheet, Net of Deferred Tax	$ 35.2	$ 21.2	$ 19.3