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Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended		12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Jul. 07, 2016	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2020	Nov. 28, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received for disposal group	$ 45.0						$ 130.0
Proceeds from the sale of business	$ 40.6				$ 135.1
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent						$ 0.6
Benefit from income taxes (1)		$ (0.2)	$ (0.2)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		0.0	0.0	$ 0.0
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense		0.0	0.0	0.0
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax		0.2	0.2	3.7
Benefit from income taxes (1)				(3.7)
Disposal Group, Including Discontinued Operation, Revenue		$ 0.0	$ 0.0	$ 0.0