Segment Information - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total net sales	$ 1,145.6	$ 1,009.6	$ 2,318.7	$ 2,226.5
Income (Loss) from Operations	28.2	(19.0)	53.3	14.1
Depreciation and amortization	32.9	36.9	66.7	76.1
Capital Expenditures			29.9	38.1
Assets of Operations	3,000.9		3,000.9		$ 3,130.9
Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	32.9	36.9	66.7	76.1
Capital Expenditures	16.9	20.4	29.9	38.1
Assets of Operations	3,000.9		3,000.9		3,130.9
Business Services
Segment Reporting Information [Line Items]
Total net sales	909.6	795.6	1,831.7	1,688.7
Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	236.0	214.0	487.0	537.8
Total Operating Segments
Segment Reporting Information [Line Items]
Total net sales	1,165.7	1,027.3	2,357.3	2,264.2
Income (Loss) from Operations	64.2	15.3	131.2	77.9
Total Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	30.4	35.8	61.4	74.4
Capital Expenditures	14.1	13.9	24.9	26.2
Assets of Operations	2,811.9		2,811.9		2,895.2
Total Operating Segments | Business Services
Segment Reporting Information [Line Items]
Total net sales	924.7	808.0	1,860.7	1,714.5
Income (Loss) from Operations	55.2	17.1	108.4	54.8
Total Operating Segments | Business Services | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	22.3	23.8	45.3	48.2
Capital Expenditures	12.5	9.1	20.3	19.8
Assets of Operations	2,181.6		2,181.6		2,220.9
Total Operating Segments | Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	241.0	219.3	496.6	549.7
Income (Loss) from Operations	9.0	(1.8)	22.8	23.1
Total Operating Segments | Marketing Solutions | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	8.1	12.0	16.1	26.2
Capital Expenditures	1.6	4.8	4.6	6.4
Assets of Operations	630.3		630.3		674.3
Intersegment Sales
Segment Reporting Information [Line Items]
Total net sales	(20.1)	(17.7)	(38.6)	(37.7)
Intersegment Sales | Business Services
Segment Reporting Information [Line Items]
Total net sales	(15.1)	(12.4)	(29.0)	(25.8)
Intersegment Sales | Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	(5.0)	(5.3)	(9.6)	(11.9)
Corporate
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(36.0)	(34.3)	(77.9)	(63.8)
Corporate | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	2.5	1.1	5.3	1.7
Capital Expenditures	2.8	$ 6.5	5.0	$ 11.9
Assets of Operations	$ 189.0		$ 189.0		$ 235.7