Retirement Benefit Plans - Change in Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Company contributions / payments	$ 11.2	$ 20.4	$ 17.9
Pension Plan
Change in plan assets:
Fair value of plan assets at beginning of year	752.5
Company contributions / payments	11.2	20.4
Fair value of plan assets at end of year	387.1	752.5
U.S. Plans | Pension Plan
Change in plan assets:
Fair value of plan assets at beginning of year	455.7	553.3
Actual return on plan assets	(120.1)	4.9
Company contributions / payments	5.2	17.0
International plan exchange rate change	0.0	0.0
Benefits paid	(139.2)	(119.5)
Fair value of plan assets at end of year	201.6	455.7	553.3
Funded status at end of year	(133.7)	(110.6)
International Plans | Pension Plan
Change in plan assets:
Fair value of plan assets at beginning of year	296.8	312.8
Actual return on plan assets	(72.3)	0.1
Company contributions / payments	6.0	3.4
International plan exchange rate change	(30.3)	(4.3)
Benefits paid	(14.7)	(15.2)
Fair value of plan assets at end of year	185.5	296.8	$ 312.8
Funded status at end of year	$ (32.6)	$ (46.3)