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Description of Business and Accounting Policies (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]                
Entity Number of Employees 4,571     4,571        
Percentage of Revenue by Foreign Subsidiaries 5.00%     6.00%        
Available-for-Sale Securities, Shares Sold     2.8          
Proceeds from sale of Investment in CyrusOne     $ 140.7 $ 0.0 $ 140.7      
Gain on sale of Investment in CyrusOne $ 0.0 $ 0.0 $ 117.7 $ 0.0 117.7      
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax           $ 14.9 $ 14.9 $ 0.7
Number of Years Over Which Remaining AMT Credits Will Be Refunded 5     5        
Reclassification Adjustment from Accumulated Other Comprehensive Income (Loss) to Retained Earnings (Accumulated Deficit), Stranded Other Comprehensive Income Taxes Arising from Tax Reform           32.2    
Defined Benefit Plan, Cost Reclassified, Cost of Services and Products   1.5     4.8      
Defined Benefit Plan, Cost Reclassified, SG&A costs   1.5     4.6      
Adjustment to revenue and cost of services and products for adoption of ASC 606   33.6     96.8      
Reduction to cost of services and selling, general and administrative expenses   $ 0.2     $ 0.8      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share   $ 0.01     $ 0.02      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share   $ 0.01     $ 0.01      
Capitalized Contract Cost, Net, Incremental Assets Related to Fulfillment and Acquisition Costs           32.3    
Capitalized Contract Cost, Net $ 33.7     $ 33.7   32.4 $ 32.5 $ 32.4
Decrease in deferred tax assets, impact of ASC 606           $ 7.1    
General Electric Company [Member]                
Description of Business and Accounting Policies [Line Items]                
Accounts Receivable from one customer greater than 10%, percentage           10.00%    
Verizon Communications Inc. [Member]                
Description of Business and Accounting Policies [Line Items]                
Accounts Receivable from one customer greater than 10%, percentage 12.00%     12.00%        
Hawaiian Telcom Holdco, Inc. [Member]                
Description of Business and Accounting Policies [Line Items]                
Entity, Number of Employees Covered by Collective Bargaining Agreement 675     675