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Accounting Changes and Recent Accounting Pronouncements (Summary balance sheet information) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets:          
Trade receivables, net $ 1,404.8 $ 1,342.1 $ 1,403.8 $ 1,404.5  
Current assets of discontinued operations 0.0 356.5 374.2 276.0  
Other current assets 695.0 568.1 427.8 351.2  
Investments and related note receivables 4,782.0 5,121.8 6,862.6 6,671.4  
Deferred tax assets 2,457.4 2,488.2 3,117.1 3,133.1  
Long-term assets of discontinued operations 0.0 10,174.6 11,266.5 11,237.4  
Other assets, net 3,338.1 3,632.9 3,741.6 3,720.2  
Liabilities:          
Deferred revenue 834.9 847.1 942.2 936.6  
Current liabilities of discontinued operations 0.0 1,967.5 1,662.6 1,635.9  
Other accrued and current liabilities 2,570.5 2,458.8 2,220.2 2,219.0  
Long-term liabilities of discontinued operations 0.0 10,072.4 10,053.5 10,014.4  
Other long-term liabilities 2,890.7 2,436.8 2,249.3 2,246.6  
Equity:          
Accumulated deficit     (5,897.5) (6,217.6)  
Noncontrolling interests $ (407.6) (533.1) (407.6) (412.0)  
Accounting change   1.2   324.5 $ 15.3
Accumulated deficit          
Equity:          
Accounting change   $ 1.2   $ 320.1 $ 15.3
ASU 2014-09 Adjustments | Accounting Standards Update 2014-09          
Assets:          
Trade receivables, net     (0.7)    
Current assets of discontinued operations     98.2    
Other current assets     76.6    
Investments and related note receivables     191.2    
Deferred tax assets     (16.0)    
Long-term assets of discontinued operations     29.1    
Other assets, net     21.4    
Liabilities:          
Deferred revenue     5.6    
Current liabilities of discontinued operations     26.7    
Other accrued and current liabilities     1.2    
Long-term liabilities of discontinued operations     39.1    
Other long-term liabilities     2.7    
Equity:          
Accumulated deficit     320.1    
Noncontrolling interests     $ 4.4