Acquisitions (Narrative) (Details) - USD ($) $ in Millions				3 Months Ended
	Dec. 16, 2020	Aug. 24, 2020	Jul. 27, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill				$ 166.5		$ 160.7
Net sales				251.9	$ 248.7
Net earnings (loss)				35.4	$ (226.2)
Arktura [Member]
Business Acquisition [Line Items]
Payments to acquire business	$ 90.9
Business acquisition, cash acquired	0.5
Fair value of tangible assets acquired, less liabilities assumed	1.8
Goodwill	56.6
Arktura [Member] | Seller [Member]
Business Acquisition [Line Items]
Business acquisition additional cash payments	$ 24.0
Business acquisition cash payment period	5 years
Arktura [Member] | Seller [Member] | Restricted Stock [Member]
Business Acquisition [Line Items]
Business acquisition, stock issued or issuable	$ 6.0
Business acquisition stock issued vesting period	5 years
Arktura [Member] | Arktura Employee | Restricted Stock [Member]
Business Acquisition [Line Items]
Business acquisition, stock issued or issuable	$ 1.4
Business acquisition stock issued vesting period	3 years
Moz Designs, Inc. [Member]
Business Acquisition [Line Items]
Payments to acquire business		$ 4.2
Business combination contingent consideration maximum earnout payable		4.7
Business combination, consideration transferred estimated fair value		2.7
Business combination, consideration transferred		$ 6.9
Turf [Member]
Business Acquisition [Line Items]
Payments to acquire business			$ 70.0
Business combination contingent consideration maximum earnout payable			48.0
Business combination, consideration transferred estimated fair value			14.1
Business combination, consideration transferred			84.1
Turf [Member] | Target Payout [Member]
Business Acquisition [Line Items]
Additional cash considerations			$ 24.0
Annual growth rate of contingent consideration			23.00%
Turf [Member] | Over Target Payout [Member]
Business Acquisition [Line Items]
Annual growth rate of contingent consideration			38.00%
Turf [Member] | Over Target Payout [Member] | Maximum [Member]
Business Acquisition [Line Items]
Additional cash considerations			$ 24.0
Arktura Moz and Turf [Member]
Business Acquisition [Line Items]
Net sales				16.5
Net earnings (loss)				$ 5.7