Restructuring and Restructuring Related Charges Restructuring and Restructuring Related Charges (Expected vs Incurred Costs) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related		$ 12.4	$ 1.3	$ 0.8
Impairment costs associated with this plan as discussed in Note D		5.4	4.9	4.1
Furniture Products
Restructuring Cost and Reserve [Line Items]
Impairment costs associated with this plan as discussed in Note D		5.1	$ 0.0	$ 0.0
Furniture Products | 2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related	$ 27.9	27.9
Impairment costs associated with this plan as discussed in Note D	5.1	5.1
Total Amount Expected to be Incurred	33.0	33.0
Restructuring and restructuring-related		11.2
Impairment costs associated with this plan as discussed in Note D		5.1
Total Amount Incurred in 2018	$ 16.0	$ 16.3