Pension and Postretirement Benefits - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 07, 2019	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Change in plan assets:
Fair value of plan assets at beginning of year		$ 1,620.4
Fair value of plan assets at end of year		1,696.4	$ 1,620.4
Amounts recorded in the consolidated balance sheets:
Prepaid pension assets		36.6	4.3
Long-term pension and postretirement benefits		(178.4)	(291.5)	[1]
Pension plans
Change in benefit obligation:
Benefit obligation at beginning of year		(1,900.3)	(1,770.3)
Service cost	$ (0.3)	(5.2)	(1.8)		$ (1.5)
Interest cost	(6.8)	(27.4)	(42.2)		(47.2)
Benefits paid		94.1	86.8
Acquisitions		(87.4)	0.0
Plan amendment		0.3
Settlement		0.1	7.7
Plan participants' contributions		(0.9)	(0.1)
Actuarial (loss) gain		85.3	(168.9)
Effect of changes in foreign currency exchange rates		9.0	(11.5)
Benefit obligation at end of year		(1,832.4)	(1,900.3)		(1,770.3)
Change in plan assets:
Fair value of plan assets at beginning of year		1,620.4	1,570.9
Actual return on plan assets		143.7	128.0
Acquisitions		22.0	0.0
Employer contributions		7.5	5.3
Plan participants' contributions		0.9	0.1
Benefits paid		(94.1)	(86.8)
Settlement		0.0	(7.7)
Effect of changes in foreign currency exchange rates		(4.0)	10.6
Fair value of plan assets at end of year		1,696.4	1,620.4		1,570.9
Net funded status of plan		(136.0)	(279.9)
Amounts recorded in the consolidated balance sheets:
Prepaid pension assets		36.6	4.3
Short-term pension and postretirement benefits		(1.2)	(0.4)
Long-term pension and postretirement benefits		(171.4)	(283.8)
Net amount recognized		(136.0)	(279.9)
Accumulated benefit obligation		1,819.3	1,890.6
Amount recognized in accumulated other comprehensive loss consists of:
Actuarial loss (gain)		14.5	161.9
Prior service cost (credit)		0.1	0.5
Total amount recognized - pretax		14.6	162.4
Postretirement benefit obligations
Change in benefit obligation:
Benefit obligation at beginning of year		(1.6)	(2.0)
Service cost	0.0	0.0	0.0		0.0
Interest cost	$ 0.0	0.0	0.0		(0.1)
Benefits paid		0.2	0.8
Acquisitions		0.0	0.0
Plan amendment
Settlement		0.0	0.0
Plan participants' contributions		0.0	(0.1)
Actuarial (loss) gain		0.1	(0.3)
Effect of changes in foreign currency exchange rates		0.0	0.0
Benefit obligation at end of year		(1.3)	(1.6)		(2.0)
Change in plan assets:
Fair value of plan assets at beginning of year		0.0	0.0
Actual return on plan assets		0.0	0.0
Acquisitions		0.0	0.0
Employer contributions		0.2	0.7
Plan participants' contributions		0.0	0.1
Benefits paid		(0.2)	(0.8)
Settlement		0.0	0.0
Effect of changes in foreign currency exchange rates		0.0	0.0
Fair value of plan assets at end of year		0.0	0.0		$ 0.0
Net funded status of plan		(1.3)	(1.6)
Amounts recorded in the consolidated balance sheets:
Prepaid pension assets		0.0	0.0
Short-term pension and postretirement benefits		(0.2)	(0.2)
Long-term pension and postretirement benefits		(1.1)	(1.4)
Net amount recognized		(1.3)	(1.6)
Amount recognized in accumulated other comprehensive loss consists of:
Actuarial loss (gain)		0.1	0.2
Prior service cost (credit)		(2.2)	(2.6)
Total amount recognized - pretax		$ (2.1)	$ (2.4)

[1] See discussion in Note 1 - Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.