Contingencies - Accrual for Probable Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingency Accrual [Roll Forward]
Litigation contingency accrual - Beginning of period	$ 1.9	$ 0.4	$ 3.2
Cash payments	(1.8)	(0.3)	(5.0)
Litigation contingency accrual - End of period	0.7	1.9	0.4
Continuing Operations
Loss Contingency Accrual [Roll Forward]
Adjustment to accruals - expense (income)	0.6	1.8	0.6
Discontinued Operations
Loss Contingency Accrual [Roll Forward]
Adjustment to accruals - expense (income)	$ 0.0	$ 0.0	$ 1.6