Commitments and Contingencies Marshalltown Tornado and Recovery (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		17 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Insurance recoveries received			$ 0.0	$ 138.0	$ 367.5
Loss (gain) from natural disaster, net of Insurance recoveries	$ (4.9)	$ 7.1	(7.6)	85.4
Net Loss(gain) from natural disaster	4.9	1.2	7.6	(11.6)
Loss Contingencies [Line Items]
Insurance recoveries received for property damage incurred from natural disaster	4.9	(7.1)	7.6	(85.4)
Insurance recoveries received			0.0	138.0	$ 367.5
Net Loss(gain) from natural disaster	4.9	1.2	7.6	(11.6)
Marshalltown Tornado [Member]
Commitments and Contingencies Disclosure [Abstract]
Site clean-up and remediation	0.0	(3.5)	0.0	19.8
Insurance recoveries received	0.0	10.0	0.0	138.0
Factory inefficiencies	0.0	0.8	0.0	9.3
Other	0.4	5.6	3.1	23.5
Total expense	0.4	2.9	3.1	52.6
Loss (gain) from natural disaster, net of Insurance recoveries	(0.4)	7.1	(3.1)	85.4
Insurance proceeds for lost profits	0.0	(8.3)	0.0	(73.8)
Net Loss(gain) from natural disaster	0.4	1.2	3.1	(11.6)
Loss Contingencies [Line Items]
Insurance recoveries received for property damage incurred from natural disaster	0.4	(7.1)	3.1	(85.4)
Site clean-up and remediation	0.0	(3.5)	0.0	19.8
Factory inefficiencies	0.0	0.8	0.0	9.3
Other	0.4	5.6	3.1	23.5
Total expense due to natural disaster	0.4	2.9	3.1	52.6
Insurance recoveries received	0.0	10.0	0.0	138.0
Insurance proceeds for lost profits	0.0	8.3	0.0	73.8
Net Loss(gain) from natural disaster	0.4	1.2	3.1	(11.6)
Marshalltown Wind Storm [Member]
Commitments and Contingencies Disclosure [Abstract]
Site clean-up and remediation	0.5	0.0	0.5	0.0
Factory inefficiencies	0.2	0.0	0.2	0.0
Other	0.9	0.0	0.9	0.0
Total expense	4.5	0.0	4.5	0.0
Loss (gain) from natural disaster, net of Insurance recoveries	(4.5)	0.0	(4.5)	0.0
Loss Contingencies [Line Items]
Insurance recoveries received for property damage incurred from natural disaster	4.5	0.0	4.5	0.0
Write-off of inventory	0.1	0.0	0.1	0.0
Site clean-up and remediation	0.5	0.0	0.5	0.0
BuildingAndBuildingImprovement	2.8	0.0	2.8	0.0
Factory inefficiencies	0.2	0.0	0.2	0.0
Other	0.9	0.0	0.9	0.0
Total expense due to natural disaster	$ 4.5	$ 0.0	$ 4.5	$ 0.0