Retirement Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Termination benefits			$ 17.4
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,517.0	$ 2,720.1
Service cost	11.9	15.1	12.7
Interest cost	69.7	68.4	86.3
Benefits paid	(155.6)	(235.0)
Subsidy paid	0.0	0.0
Divestiture	(75.8)	0.0
Effect of currency rates	(3.2)	(1.3)
Net actuarial (gains) losses - discount rate change	(556.8)	(104.0)
Net actuarial (gains) losses - other	11.1	53.7
Settlement gain	0.0	0.0
Termination benefits	0.0	0.0	10.9
Benefit obligation at end of year	1,818.3	2,517.0	2,720.1
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	287.3	357.6
Service cost	1.1	1.5	2.3
Interest cost	7.7	8.0	10.7
Benefits paid	(29.7)	(28.9)
Subsidy paid	0.3	0.4
Divestiture	0.0	0.0
Effect of currency rates	0.0	0.0
Net actuarial (gains) losses - discount rate change	(48.2)	(9.0)
Net actuarial (gains) losses - other	(5.8)	0.7
Settlement gain	0.0	(43.0)
Termination benefits	0.0	0.0	6.7
Benefit obligation at end of year	$ 212.7	$ 287.3	$ 357.6