Discontinued Operations - Other Significant Operating Non-Cash Items (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash asset impairment			$ 0.3	$ 0.8	$ 1.5
Net proceeds from divestiture of discontinued operations			9.0	0.0	0.0
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation			4.1	8.6	8.2
Amortization of intangible assets			0.3	1.4	1.1
Non-cash asset impairment	$ 82.0	$ 44.0	126.0	111.2	0.0
Non-cash loss on sale of discontinued operations			22.5	0.0	0.0
Stock-based compensation			0.0	0.5	0.3
Capital expenditures			2.4	2.7	3.7
Net proceeds from divestiture of discontinued operations			$ 9.0	$ 0.0	$ 0.0