Impairment Charges (Components of Fair Values In Relation to Their Respective Carrying Values) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) reporting_unit	Dec. 31, 2020 USD ($)	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 1,449.6	$ 1,388.8
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow	3.00%	3.00%
Less than 50%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 67.5	$ 97.2
10-year Compound Annual Growth Rate Range for Sales	7.80%	2.10%
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow	3.00%	3.00%
Discount Rate Ranges	10.00%	9.00%
50% - 100%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 101.0	$ 916.3
10-year Compound Annual Growth Rate Range for Sales	5.50%
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow	3.00%	3.00%
Discount Rate Ranges	9.00%
101% - 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 1,086.9	$ 247.7
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow	3.00%	3.00%
Greater than 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 194.2	$ 127.6
10-year Compound Annual Growth Rate Range for Sales		6.70%
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow	3.00%	3.00%
Discount Rate Ranges	9.00%	9.00%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
10-year Compound Annual Growth Rate Range for Sales	2.90%	1.60%
Discount Rate Ranges	8.00%	8.50%
Minimum | 50% - 100%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	50.00%	50.00%
10-year Compound Annual Growth Rate Range for Sales		2.00%
Discount Rate Ranges		9.00%
Minimum | 101% - 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	101.00%	101.00%
10-year Compound Annual Growth Rate Range for Sales	3.10%	1.60%
Discount Rate Ranges	8.00%	8.50%
Minimum | Greater than 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	300.00%	300.00%
10-year Compound Annual Growth Rate Range for Sales	2.90%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
10-year Compound Annual Growth Rate Range for Sales	10.40%	6.70%
Discount Rate Ranges	10.00%	10.00%
Maximum | Less than 50%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	50.00%	50.00%
Maximum | 50% - 100%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	100.00%	100.00%
10-year Compound Annual Growth Rate Range for Sales		3.60%
Discount Rate Ranges		10.00%
Maximum | 101% - 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value (as a percent)	300.00%	300.00%
10-year Compound Annual Growth Rate Range for Sales	3.30%	1.70%
Discount Rate Ranges	8.50%	9.50%
Maximum | Greater than 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
10-year Compound Annual Growth Rate Range for Sales	10.40%
Aerospace Products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 67.5	$ 59.5
Number of reporting units tested for goodwill impairment | reporting_unit	1
Fair values of reporting units in excess of carrying amount (as a percent) (at least)			28.00%	51.00%
Work Furniture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 101.0	97.2
Number of reporting units tested for goodwill impairment | reporting_unit	1
Fair values of reporting units in excess of carrying amount (as a percent) (at least)			85.00%	25.00%
Aerospace and Bedding
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of reporting units tested for goodwill impairment | reporting_unit	2
Bedding
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 908.3	$ 856.8
Fair values of reporting units in excess of carrying amount (as a percent) (at least)			171.00%	65.00%