Employee Benefit Plans Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	$ 8.4	$ 8.0
Noncurrent Pension Liability	397.4	558.3
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	405.8	566.3
Net Actuarial Gain (Loss) in Balance Sheet	(621.8)	(767.9)
Prior Service Credit in Balance Sheet	(0.6)	(0.6)
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(622.4)	(768.5)
Pension Deferred Tax Asset in Balance Sheet	239.2	273.9
Pension Recognized in Balance Sheet, Net of Deferred Tax	(383.2)	(494.6)	$ (455.4)
Pension Plan | UNITED KINGDOM
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	0.0	0.0
Noncurrent Pension Liability	0.0	5.9
Noncurrent Pension Asset	(25.4)	0.0
Funded Status of Plan	(25.4)	5.9
Net Actuarial Gain (Loss) in Balance Sheet	(42.9)	(70.5)
Prior Service Credit in Balance Sheet	(0.2)	(0.2)
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(43.1)	(70.7)
Pension Deferred Tax Asset in Balance Sheet	9.1	16.0
Pension Recognized in Balance Sheet, Net of Deferred Tax	(34.0)	(54.7)	(48.9)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	1.4	1.5
Noncurrent Pension Liability	99.9	109.7
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	101.3	111.2
Net Actuarial Gain (Loss) in Balance Sheet	13.6	11.0
Prior Service Credit in Balance Sheet	2.7	2.9
Pension Recognized in Balance Sheet, Gross of Deferred Tax	16.3	13.9
Pension Deferred Tax Asset in Balance Sheet	4.9	5.4
Pension Recognized in Balance Sheet, Net of Deferred Tax	$ 21.2	$ 19.3	$ 19.5