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Description of Business and Accounting Policies (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Customers with greater than 10% of Accounts Receivable [Line Items]              
Percentage of Revenue by Foreign Subsidiaries 6.00%     6.00%      
Available-for-Sale Securities, Shares Sold     2.8        
Proceeds from sale of Investment in CyrusOne     $ 140,700,000 $ 0 $ 140,700,000    
Gain on sale of Investment in CyrusOne $ 0 $ 0 $ 117,700,000 0 117,700,000    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 14,900,000     14,900,000   $ 14,900,000 $ 700,000
Reclassification Adjustment from Accumulated Other Comprehensive Income (Loss) to Retained Earnings (Accumulated Deficit), Stranded Other Comprehensive Income Taxes Arising from Tax Reform           32,200,000  
Defined Benefit Plan, Cost Reclassified, Cost of Services and Products   1,600,000     3,300,000    
Defined Benefit Plan, Cost Reclassified, SG&A costs   1,600,000     3,100,000    
Adjustment to revenue and cost of services and products for adoption of ASC 606   34,600,000     63,200,000    
Reduction to cost of services and selling, general and administrative expenses   $ 300,000     $ 600,000    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share         $ 0.01    
Capitalized Contract Cost, Net, Incremental Assets Related to Fulfillment and Acquisition Costs           32,300,000  
Capitalized Contract Cost, Net $ 32,500,000.0     $ 32,500,000.0   32,400,000.0 $ 32,400,000.0
Decrease in deferred tax assets, impact of ASC 606           $ 7,100,000  
General Electric Company [Member]              
Customers with greater than 10% of Accounts Receivable [Line Items]              
Accounts Receivable from one customer greater than 10%, percentage 10.00%     10.00%   10.00%  
Verizon Communications Inc. [Member]              
Customers with greater than 10% of Accounts Receivable [Line Items]              
Accounts Receivable from one customer greater than 10%, percentage 12.00%     12.00%