Pension and Postretirement Benefits - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Fair value of plan assets at beginning of year	$ 1,696.4
Fair value of plan assets at end of year	1,250.2	$ 1,696.4
Amounts recorded in the consolidated balance sheets:
Prepaid pension assets	4.0	36.6
Long-term pension and postretirement benefits	(158.2)	(178.4)
Pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	(1,832.4)	(1,900.3)
Service cost	(3.0)	(5.2)	$ (1.8)
Interest cost	(35.2)	(27.4)	(42.2)
Benefits paid	91.2	94.1
Acquisitions	0.0	(87.4)
Plan amendment	0.2	0.3
Settlement	8.4	0.1
Plan participants' contributions	(0.9)	(0.9)
Actuarial (loss) gain	337.3	85.3
Effect of changes in foreign currency exchange rates	34.0	9.0
Benefit obligation at end of year	(1,400.4)	(1,832.4)	(1,900.3)
Change in plan assets:
Fair value of plan assets at beginning of year	1,696.4	1,620.4
Actual return on plan assets	(323.8)	143.7
Acquisitions	0.0	22.0
Employer contributions	7.0	7.5
Plan participants' contributions	0.9	0.9
Benefits paid	(91.2)	(94.1)
Settlement	(8.4)	0.0
Effect of changes in foreign currency exchange rates	(30.7)	(4.0)
Fair value of plan assets at end of year	1,250.2	1,696.4	1,620.4
Net funded status of plan	(150.2)	(136.0)
Amounts recorded in the consolidated balance sheets:
Prepaid pension assets	4.0	36.6
Short-term pension and postretirement benefits	(1.4)	(1.2)
Long-term pension and postretirement benefits	(152.8)	(171.4)
Net amount recognized	(150.2)	(136.0)
Accumulated benefit obligation	1,393.4	1,819.3
Amount recognized in accumulated other comprehensive loss consists of:
Actuarial loss (gain)	76.3	14.5
Prior service cost (credit)	(0.1)	0.1
Total amount recognized - pretax	76.2	14.6
Postretirement benefit obligations
Change in benefit obligation:
Benefit obligation at beginning of year	(1.3)	(1.6)
Service cost	0.0	0.0	0.0
Interest cost	0.0	0.0	0.0
Benefits paid	0.2	0.2
Acquisitions	0.0	0.0
Plan amendment	0.0	0.0
Settlement	0.0	0.0
Plan participants' contributions	0.0	0.0
Actuarial (loss) gain	0.1	0.1
Effect of changes in foreign currency exchange rates	0.0	0.0
Benefit obligation at end of year	(1.0)	(1.3)	(1.6)
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	0.2
Plan participants' contributions	0.0	0.0
Benefits paid	(0.2)	(0.2)
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	(1.0)	(1.3)
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	(0.8)	(1.1)
Net amount recognized	(1.0)	(1.3)
Amount recognized in accumulated other comprehensive loss consists of:
Actuarial loss (gain)	(0.1)	0.1
Prior service cost (credit)	(1.7)	(2.2)
Total amount recognized - pretax	$ (1.8)	$ (2.1)