Discontinued Operations - Financial Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) Income from Discontinued Operations, Net of Taxes	$ (1.3)	$ 7.7	$ (2.2)	$ 8.0
Gain on Sale of Discontinued Operations, Net of Taxes	3.6	0.0	3.6	0.0
Discontinued Operations, Net of Taxes	2.3	7.7	1.4	8.0
ASC [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	17.7	61.9	27.2	73.6
Operating expense	15.4	44.5	22.5	52.3
Depreciation expense	1.7	3.5	1.7	3.5
Selling, general and administrative expense	0.8	2.1	2.8	4.2
Total Expenses	17.9	50.1	27.0	60.0
Other expense	(1.5)	(1.8)	(3.0)	(3.2)
(Loss) Income from Discontinued Operations Before Taxes	(1.7)	10.0	(2.8)	10.4
Income tax benefit (expense)	0.4	(2.3)	0.6	(2.4)
(Loss) Income from Discontinued Operations, Net of Taxes	(1.3)	7.7	(2.2)	8.0
Gain on Sale of Discontinued Operations, Net of Taxes	3.6	0.0	3.6	0.0
Discontinued Operations, Net of Taxes	$ 2.3	$ 7.7	$ 1.4	$ 8.0