Employee Benefit Plans - Obligations and Funded Status (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in projected benefit obligation:
Actuarial (gains) losses	$ (9.9)	$ 6.8
Change in plan assets:
Fair value of plan assets — beginning of year			$ 478.1
Fair value of plan assets — end of year	454.0	478.1	454.0	$ 478.1
United States
Change in projected benefit obligation:
Projected benefit obligation — beginning of year			364.7	348.2
Service cost			0.0	0.0	$ 0.0
Interest cost			8.4	10.8	13.3
Actuarial (gains) losses			(12.9)	30.4
Settlements			(10.5)	(10.3)
Benefits paid			(14.3)	(14.4)
Foreign exchange and other			0.0	0.0
Projected benefit obligation — end of year	335.4	364.7	335.4	364.7	348.2
Change in plan assets:
Fair value of plan assets — beginning of year			279.8	263.6
Actual return on plan assets			(0.1)	35.1
Contributions (employer and employee)			5.5	5.8
Settlements			(10.5)	(10.3)
Benefits paid			(14.3)	(14.4)
Foreign exchange and other			0.0	0.0
Fair value of plan assets — end of year	260.4	279.8	260.4	279.8	263.6
Funded status at year-end	(75.0)	(84.9)	(75.0)	(84.9)
Amounts recognized in the consolidated balance sheets consist of:
Other assets	2.2	2.6	2.2	2.6
Accrued expenses	(5.2)	(5.4)	(5.2)	(5.4)
Other long-term liabilities	(72.0)	(82.1)	(72.0)	(82.1)
Net amount recognized	(75.0)	(84.9)	(75.0)	(84.9)
Amount recognized in accumulated other comprehensive income (pre-tax) consists of:
Amount recognized in accumulated other comprehensive income (pre-tax) consists of — net prior service (credits) costs	(0.1)	(0.2)	(0.1)	(0.2)
Foreign Plan
Change in projected benefit obligation:
Projected benefit obligation — beginning of year			192.2	175.0
Service cost			0.0	0.0	0.0
Interest cost			3.4	3.8	4.8
Actuarial (gains) losses			(4.8)	14.3
Settlements			(3.0)	0.0
Benefits paid			(5.1)	(6.7)
Foreign exchange and other			(0.3)	5.8
Projected benefit obligation — end of year	182.4	192.2	182.4	192.2	175.0
Change in plan assets:
Fair value of plan assets — beginning of year			198.3	178.1
Actual return on plan assets			3.6	19.9
Contributions (employer and employee)			0.9	0.9
Settlements			(3.0)	0.0
Benefits paid			(5.1)	(6.7)
Foreign exchange and other			(1.1)	6.1
Fair value of plan assets — end of year	193.6	198.3	193.6	198.3	$ 178.1
Funded status at year-end	11.2	6.1	11.2	6.1
Amounts recognized in the consolidated balance sheets consist of:
Other assets	11.4	8.6	11.4	8.6
Accrued expenses	0.0	0.0	0.0	0.0
Other long-term liabilities	(0.2)	(2.5)	(0.2)	(2.5)
Net amount recognized	11.2	6.1	11.2	6.1
Amount recognized in accumulated other comprehensive income (pre-tax) consists of:
Amount recognized in accumulated other comprehensive income (pre-tax) consists of — net prior service (credits) costs	$ 1.2	$ 1.2	$ 1.2	$ 1.2