Employee Benefits - Amounts Recognized for Pension Plans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 06, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Noncurrent assets	$ 40.5	$ 253.0	$ 63.2
Current liabilities	0.6		0.7
Noncurrent liabilities	85.8		14.1
Total	$ (45.9)		$ 48.4