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Discontinued Operations (Details) - USD ($) $ in Millions		2 Months Ended	3 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Mar. 13, 2020	Mar. 13, 2020	Mar. 31, 2020	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash purchase price			$ 1,164.7	$ 0.0
Income:
Income from discontinued operations, net of tax			$ 1,068.5	13.3
U.S. Federal Business \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash purchase price	$ 1,200.0
Revenue		$ 149.5		141.3
Income:
Operations		9.0		17.7
Gain on sale		1,061.7		0.0
Income from discontinued operations		1,070.7		17.7
Income tax provision		2.2		4.4
Income from discontinued operations, net of tax		$ 1,068.5		$ 13.3