Recently Issued Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share		$ 0.11	$ 0.02
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share		$ 0.12	$ 20,000.00
Capitalized Contract Cost, Net		$ 32.4	$ 32.0		$ 32.0	$ 30.6
Decrease in deferred tax assets, impact of ASC 606						$ 10.8
Defined Benefit Plan, Cost Reclassified, Cost of Services and Products		6.6	1.3
Defined Benefit Plan, Cost Reclassified, SG&A costs		6.0	3.0
Defined Benefit Plan, Cost Reclassified, Other Operating Costs and Expenses		4.0
Reclassification adjustment to accumulated deficit for stranded other comprehensive income taxes arising from tax reform		0.0
Assets (Fulfillment and Acquisition Costs) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			30.1
Sales Revenue, Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(222.8)	(168.2)
Cost of Sales [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(222.8)	(168.2)
Expense (Fulfillment and Acquisition Costs) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(0.7)	(1.5)
Tax Expense [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(4.2)	$ 0.5
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset				$ 35.0
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset				$ 45.0
AOCI Attributable to Parent
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification adjustment to accumulated deficit for stranded other comprehensive income taxes arising from tax reform	[1]	$ (32.2)

[1] Per ASU 2018-02, entities can elect to make a one-time reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from newly enacted corporate tax rates under the Tax Cuts and Jobs Act. The Company elected to make the change and recorded the adjustment in 2017.