Discontinued Operations and Dispositions - Narrative (Details) $ in Millions				12 Months Ended
	Jul. 20, 2019 USD ($)	Oct. 01, 2018 USD ($) shares	Mar. 07, 2018 company	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of operating segments | segment				2
Cash paid to company for direct sales of assets and liabilities				$ 0.0	$ 0.0	$ 21.5
Gain (loss) from stake in business				40.8	0.0	$ 15.3
Telestream, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) from stake in business	$ 41.0
Equity stake in the Combined Business (as a percent)	33.00%
Carrying amount of investment in Combined Business				82.0
Equity income (loss) from stake in the Combined Business				$ (4.0)
A&S Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration, number of shares (in shares) | shares		15,800,000
A&S Business | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of operating segments | company			4
Consideration		$ 2,700.0
Exchange offer		$ 1,300.0
Consideration, number of shares (in shares) | shares		15,824,931
Cash paid to company for direct sales of assets and liabilities		$ 1,000.0
Debt-for-debt exchange		250.0
Cash paid to company as a dividend		$ 150.0
After tax gain on transaction					1,900.0
Pretax transaction-related costs					$ 77.0
A&S Business | Discontinued Operations | Stevens Holding Company, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stockholders right to exchange (in shares) | shares		35,000,000