Discontinued Operations - Schedule of Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payment to TZI		$ 1.9
Gain on disposal of discontinued operations, net of tax	$ 0.0		$ 9.4		$ 0.0	$ 9.3
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of discontinued operations before income tax				$ 12.7		12.6
Income tax expense				3.3		3.3
Gain on disposal of discontinued operations, net of tax				$ 9.4		$ 9.3
Discontinued Operations, Disposed of by Means Other than Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of discontinued operations, net of tax			$ 11.4
DLW Subsidiary | Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business							$ 90.2