Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment	$ 10.1	$ 0.0	$ 0.0
Current assets of discontinued operations	56.6	55.3
Long-term assets of discontinued operations	0.5	118.4
Current liabilities of discontinued operations	15.8	22.0
Long-term liabilities of discontinued operations	0.6	0.8
United States Book Business | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net sales	213.8	207.9	180.2
Total cost of sales, excluding depreciation and amortization	226.8	207.9	168.1
Selling, general and administrative expenses	5.5	13.2	15.1
Depreciation and amortization	13.6	15.8	14.0
Restructuring, impairment and transaction-related charges	92.1	0.3	0.5
Goodwill impairment	10.1	0.0	0.0
Other expenses, net	0.1	0.1	0.2
Loss from discontinued operations before income taxes	(134.4)	(29.4)	(17.7)
Income tax benefit	(33.8)	(7.4)	(6.8)
Loss from discontinued operations, net of tax	(100.6)	(22.0)	(10.9)
Impairment of tangible assets	86.5
Impairment of contract assets	5.6
Cash provided by (used in) operating activities	(8.0)	(10.9)	(5.7)
Cash provided by (used in) investing activities	(17.2)	(14.5)	$ (11.5)
Receivables—net	19.6	31.1
Inventories	14.0	21.6
Prepaid expenses and other current assets	23.0	2.6
Current assets of discontinued operations	56.6	55.3
Property, plant and equipment—net	0.0	103.6
Operating lease right-of-use assets—net	0.2	0.0
Goodwill	0.0	10.1
Other long-term assets	0.3	4.7
Long-term assets of discontinued operations	0.5	118.4
Accounts payable	7.0	14.7
Other current liabilities	8.5	7.2
Current portion of finance lease obligations	0.1	0.1
Current portion of operating lease obligations	0.2	0.0
Current liabilities of discontinued operations	15.8	22.0
Finance lease obligations	0.0	0.0
Other long-term liabilities	0.6	0.8
Long-term liabilities of discontinued operations	$ 0.6	$ 0.8