Income Taxes - Valuation Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of year	$ 141.5	$ 128.1	$ 118.3
Expiring tax credits	(0.2)	(0.7)	(0.4)
Acquisitions and dispositions	0.0	(0.8)	4.9
Changes in judgment about deferred tax assets(a)	(46.1)	8.8	(2.4)
Income from continuing operations	173.5	103.1	16.8
Other comprehensive income (loss)	201.0	89.5	(16.2)
Foreign currency exchange effects	(2.6)	(1.1)	(0.1)
End of year	77.3	141.5	128.1
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Income from continuing operations	(1.4)	7.4	8.1
Other comprehensive income (loss)	$ (13.9)	$ (0.2)	$ (0.3)