Pension and Other Post-Retirement Benefits - Pension Obligations, Plan Assets, and Other Post-retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$ 465.5
Company contributions	2.3	$ 2.3	$ 2.3
Plan assets at end of year	462.1	465.5
Amount Recognized
Other liabilities	(68.3)	(82.0)
Defined Benefit Pension [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	508.6	475.4
Service cost	8.7	8.1	6.5
Interest cost	8.1	12.3	15.2
Actuarial loss	3.1	(45.2)
Benefits paid	39.9	33.4
Effect of foreign exchange rate changes	(0.5)	1.0
Benefit obligation at end of year	481.9	508.6	475.4
Change in Fair Value of Plan Assets
Plan assets at beginning of year	465.5	432.7
Actual return on plan assets	34.3	61.4
Effect of exchange rate changes	(0.5)	1.2
Company contributions	2.7	3.6
Benefits paid	(39.9)	(33.4)
Plan assets at end of year	462.1	465.5	432.7
Funded Status at end of year	(19.8)	(43.1)
Amount Recognized
Other liabilities	(19.8)	(43.1)
Accumulative other comprehensive loss:
Net actuarial loss	75.8	109.9
Prior service credit (cost)	0.0	0.0
Accumulated other comprehensive loss	75.8	109.9
Defined Benefit Plan, Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss)	56.0	66.8
After-tax amount recognized in accumulated other comprehensive loss	56.7	82.2
Retiree Health and Life [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	22.9	24.6
Service cost	0.2	0.2	0.2
Interest cost	0.3	0.5	0.9
Actuarial loss	2.0	0.2
Benefits paid	1.5	2.2
Effect of foreign exchange rate changes	0.0	0.0
Benefit obligation at end of year	19.9	22.9	24.6
Change in Fair Value of Plan Assets
Plan assets at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Effect of exchange rate changes	0.0	0.0
Company contributions	1.5	2.2
Benefits paid	(1.5)	(2.2)
Plan assets at end of year	0.0	0.0	$ 0.0
Funded Status at end of year	(19.9)	(22.9)
Amount Recognized
Other liabilities	(19.9)	(22.9)
Accumulative other comprehensive loss:
Net actuarial loss	(4.8)	(3.0)
Prior service credit (cost)	(0.8)	(1.0)
Accumulated other comprehensive loss	(5.6)	(4.0)
Defined Benefit Plan, Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss)	(25.5)	(26.9)
After-tax amount recognized in accumulated other comprehensive loss	$ (4.2)	$ (3.0)