Commitments and Contingencies Marshalltown Tornado and Recovery (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss (gain) from natural disaster, net of Insurance recoveries	$ 0.0	$ (1.6)
Net Loss(gain) from natural disaster	0.0	1.6
Loss Contingencies [Line Items]
Insurance recoveries received for property damage incurred from natural disaster	0.0	1.6
Net Loss(gain) from natural disaster	$ 0.0	$ 1.6