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General (Schedule of Impact of Adoption on Opening Financial Statement Balances) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Current assets $ 1,783.9 $ 1,947.5 $ 1,773.1
Total assets 9,029.5 9,111.2 8,967.6
Current liabilities $ 2,422.6 2,516.5 2,412.4
Total liabilities   5,833.8 $ 5,708.9
Impact of Adoption | Revenue Recognition ASU 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Current assets   174.4  
Total assets   143.6  
Current liabilities   104.1  
Total liabilities   $ 124.9