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Investments (Schedule of Summarized Financial Condition and Result of Operations) (Details) - Ziggo [Member] - USD ($)
$ in Millions
9 Months Ended 10 Months Ended
Dec. 31, 2013
Nov. 11, 2014
Dec. 31, 2014
Summarized financial condition of Ziggo      
Current assets     $ 261.9
Long-term assets     6,131.5
Total assets     6,393.4
Current liabilities     539.3
Long-term liabilities     4,516.0
Owners’ equity     1,338.1
Total liabilities and owners’ equity     $ 6,393.4
Summarized results of operations of Ziggo      
Revenue $ 1,570.7 $ 1,876.9  
Operating income 418.5 336.0  
Net earnings (loss) $ 199.1 $ (230.3)