Post Retirement Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Plan Assets:
Plan assets		$ 150.3	$ 147.8	$ 150.5
Group BPCE Life
Plan Assets:
Plan assets	[1]	0.1	0.1
Swiss Life Collective BVG Foundation
Plan Assets:
Plan assets	[2]	$ 150.2	$ 147.7
Guaranteed minimum return on mandatory withdrawal portion of fund (as a percent)		1.00%
Guaranteed minimum return on non-mandatory withdrawal portion of fund (as a percent)		0.25%
The Company's percentage of returns above the guaranteed minimum		90.00%
Percentage of returns above the guaranteed minimum to be retained by Swiss Life		10.00%
Capital and Interest rate guarantee provided by Swiss Life		100.00%
Swiss Life Collective BVG Foundation: Bonds
Plan Assets:
Target allocation (as a percent)		65.00%
Swiss Life Collective BVG Foundation: Cash
Plan Assets:
Target allocation (as a percent)		2.50%
Swiss Life Collective BVG Foundation: Equity securities
Plan Assets:
Target allocation (as a percent)		7.50%
Swiss Life Collective BVG Foundation: Real estate and mortgages
Plan Assets:
Target allocation (as a percent)		25.00%

[1] The Company’s pension plan in France is invested in a larger fund that invests in a variety of instruments. The assets are not directly dedicated to the French pension plan. The Group BPCE Life fund invests in debt securities of foreign corporations and governments, equity securities of foreign government funds and private real estate funds.

[2] The Company’s pension plan in Switzerland is outsourced to Swiss Life AG, an outside insurance provider. Under the insurance contract, the plan assets are invested in Swiss Life Collective BVG Foundation (the Foundation), which is an umbrella fund for which the retirement savings and interest rates are guaranteed a minimum of 1.0% on the mandatory withdrawal portion, as defined by Swiss law, and 0.25% on the non-mandatory portion starting 2023. The Foundation utilizes plan administrators and investment managers to oversee the investment allocation process, set long-term strategic targets and monitor asset allocations. The target allocations are 65% bonds, 2.5% cash, 7.5% equity investments and 25% real estate and mortgages. Should the Foundation yield a return greater than the guaranteed amounts, the Company, according to Swiss law, shall receive 90% of the additional return with Swiss Life AG retaining 10%. All investments and insurance risks are fully covered and there is a 100% capital and interest rate guarantee provided by Swiss Life. The withdrawal benefits and interest allocations are secured at all times by Swiss Life AG.