Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, period increase			$ (0.1)	$ 5.6
Goodwill impaired			$ 0.0	1.6	$ 0.0
BMH Systems
Goodwill [Line Items]
Goodwill, period increase	$ (0.1)			$ 6.3
Goodwill impaired		$ 1.6