Segment Information - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total net sales	$ 1,267.8	$ 1,191.3	$ 3,586.5	$ 3,417.7
Income (Loss) from Operations	73.1	15.9	126.4	30.0
Depreciation and amortization	32.3	36.2	99.0	112.3
Capital Expenditures			48.6	54.4
Assets of Operations	3,093.4		3,093.4		$ 3,130.9
Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	32.3	36.2	99.0	112.3
Capital Expenditures	18.7	16.3	48.6	54.4
Assets of Operations	3,093.4		3,093.4		3,130.9
Business Services
Segment Reporting Information [Line Items]
Total net sales	1,003.6	936.8	2,835.3	2,625.4
Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	264.2	254.5	751.2	792.3
Total Operating Segments
Segment Reporting Information [Line Items]
Total net sales	1,287.3	1,211.7	3,644.6	3,475.8
Income (Loss) from Operations	101.9	79.4	233.1	157.3
Total Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	29.9	34.9	91.3	109.3
Capital Expenditures	14.4	12.8	39.3	39.0
Assets of Operations	2,915.5		2,915.5		2,895.2
Total Operating Segments | Business Services
Segment Reporting Information [Line Items]
Total net sales	1,018.8	953.0	2,879.5	2,667.4
Income (Loss) from Operations	84.8	69.1	193.2	123.9
Total Operating Segments | Business Services | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	22.1	23.5	67.4	71.7
Capital Expenditures	11.8	10.2	32.1	30.0
Assets of Operations	2,263.7		2,263.7		2,220.9
Total Operating Segments | Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	268.5	258.7	765.1	808.4
Income (Loss) from Operations	17.1	10.3	39.9	33.4
Total Operating Segments | Marketing Solutions | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	7.8	11.4	23.9	37.6
Capital Expenditures	2.6	2.6	7.2	9.0
Assets of Operations	651.8		651.8		674.3
Intersegment Sales
Segment Reporting Information [Line Items]
Total net sales	(19.5)	(20.4)	(58.1)	(58.1)
Intersegment Sales | Business Services
Segment Reporting Information [Line Items]
Total net sales	(15.2)	(16.2)	(44.2)	(42.0)
Intersegment Sales | Marketing Solutions
Segment Reporting Information [Line Items]
Total net sales	(4.3)	(4.2)	(13.9)	(16.1)
Corporate
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(28.8)	(63.5)	(106.7)	(127.3)
Corporate | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	2.4	1.3	7.7	3.0
Capital Expenditures	4.3	$ 3.5	9.3	$ 15.4
Assets of Operations	$ 177.9		$ 177.9		$ 235.7