Other Operating and Non-Operating Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Nonoperating Income (Expense) [Abstract]
Reorganization charges	$ (2.0)
Interest income	0.0	$ 4.0
SERP market adjustments	(1.0)	1.0
Interest expense	(6.0)	(5.0)
Amortization of debt charges	0.0	0.0
Interest Costs Capitalized Adjustment	0.0	(1.0)
Interest expense, net	(7.0)	1.0
Net periodic pension cost, excluding service cost	(1.0)	(1.0)
Gain on acquisition of controlling interest	0.0	14.0
Foreign currency gain (loss)	6.0	(2.0)
Total non-operating income (expense)	$ 5.0	$ 11.0