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Summary of Significant Accounting Policies - Schedule of Changes in Carrying Value of Goodwill, by Reportable Operating Segment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 01, 2018
Oct. 01, 2016
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gross amount of goodwill [Roll Forward]            
Beginning balance       $ 4,070,267,000 $ 3,905,021,000  
Deductible goodwill acquired during the year     $ 10,885,000 9,895,000 10,885,000  
Non-deductible goodwill acquired during the year       467,703,000 49,503,000  
Goodwill impairment $ 0 $ 0 (3,011,000) 0 (3,011,000) $ 0
Fair value and other adjustments       4,469,000 6,628,000  
Currency effects       (110,102,000) 104,756,000  
Ending balance     4,070,267,000 4,441,030,000 4,070,267,000 3,905,021,000
Goodwill, Purchase Accounting Adjustments, Property, Plant And Equipment, Intangibles, Deferred Income Tax And Other Liabilities       (2,717,000)    
Accumulated goodwill impairment     135,420,000 135,420,000 135,420,000  
Net cash paid and received for previous acquisitions       23,967,000 137,000 (182,000)
Payments for (Proceeds from) Previous Acquisition From Previous Year       7,186,000    
North American Records and Information Management Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       2,269,446,000 2,280,911,000  
Deductible goodwill acquired during the year     894,000 0 894,000  
Non-deductible goodwill acquired during the year       0 0  
Goodwill impairment         0  
Fair value and other adjustments       (423,000) (25,195,000)  
Currency effects       (16,026,000) 12,836,000  
Ending balance     2,269,446,000 2,251,795,000 2,269,446,000 2,280,911,000
Accumulated goodwill impairment     85,909,000 85,909,000 85,909,000  
North American Data Management Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       497,851,000 493,966,000  
Deductible goodwill acquired during the year     0 0 0  
Non-deductible goodwill acquired during the year       0 0  
Goodwill impairment         0  
Fair value and other adjustments       0 208,000  
Currency effects       (4,360,000) 3,677,000  
Ending balance     497,851,000 493,491,000 497,851,000 493,966,000
Accumulated goodwill impairment     0 0 0  
Western European Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       396,489,000 349,421,000  
Deductible goodwill acquired during the year     0 0 0  
Non-deductible goodwill acquired during the year       5,231,000 0  
Goodwill impairment         0  
Fair value and other adjustments       0 10,536,000  
Currency effects       (19,914,000) 36,532,000  
Ending balance     396,489,000 381,806,000 396,489,000 349,421,000
Accumulated goodwill impairment     46,500,000 46,500,000 46,500,000  
Other International Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       846,433,000 743,077,000  
Deductible goodwill acquired during the year     9,274,000 3,251,000 9,274,000  
Non-deductible goodwill acquired during the year       28,999,000 24,970,000  
Goodwill impairment         0  
Fair value and other adjustments       4,283,000 21,079,000  
Currency effects       (64,743,000) 51,548,000  
Ending balance     846,433,000 818,223,000 846,433,000 743,077,000
Accumulated goodwill impairment     0 0 0  
Global Data Center Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       0 0  
Deductible goodwill acquired during the year     0 0 0  
Non-deductible goodwill acquired during the year       429,853,000 0  
Goodwill impairment         0  
Fair value and other adjustments       0 0  
Currency effects       (3,897,000) 0  
Ending balance     0 425,956,000 0 0
Accumulated goodwill impairment     0 0 0  
Corporate and Other Business            
Gross amount of goodwill [Roll Forward]            
Beginning balance       60,048,000 37,646,000  
Deductible goodwill acquired during the year     717,000 6,644,000 717,000  
Non-deductible goodwill acquired during the year       3,620,000 24,533,000  
Goodwill impairment         (3,011,000)  
Fair value and other adjustments       609,000 0  
Currency effects       (1,162,000) 163,000  
Ending balance     60,048,000 69,759,000 60,048,000 $ 37,646,000
Accumulated goodwill impairment     $ 3,011,000 3,011,000 3,011,000  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         (3,515,000)  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | North American Records and Information Management Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         0  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | North American Data Management Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         0  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | Western European Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         0  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | Other International Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         (3,515,000)  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | Global Data Center Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         0  
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment | Corporate and Other Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations         $ 0  
Disposal Group, Not Discontinued Operations | IMFS            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       (1,202,000)    
Disposal Group, Not Discontinued Operations | IMFS | North American Records and Information Management Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       (1,202,000)    
Disposal Group, Not Discontinued Operations | IMFS | North American Data Management Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       0    
Disposal Group, Not Discontinued Operations | IMFS | Western European Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       0    
Disposal Group, Not Discontinued Operations | IMFS | Other International Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       0    
Disposal Group, Not Discontinued Operations | IMFS | Global Data Center Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       0    
Disposal Group, Not Discontinued Operations | IMFS | Corporate and Other Business            
Gross amount of goodwill [Roll Forward]            
Goodwill allocated to divested operations       $ 0