Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tangible asset impairment charges	$ 0.8	$ 2.5
Discontinued Operations, Held-for-sale | United States Book Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net sales		40.3
Total cost of sales, excluding depreciation and amortization		41.1
Selling, general and administrative expenses		1.9
Restructuring, impairment and transaction-related charges		2.2
Other expenses, net		0.0
Loss from discontinued operations before income taxes		(4.9)
Income tax benefit		(1.1)
Loss from discontinued operations, net of tax		(3.8)
Tangible asset impairment charges		$ 1.3