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Debt Debt (Term Loan Credit Agreement) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Apr. 30, 2017
Jan. 26, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 15, 2016
Debt Instrument [Line Items]                  
Gain (Loss) on Extinguishment of Debt           $ (47.6) $ 0.0 $ (33.2)  
$1.5 Billion Term Loan Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         $ 1,500.0        
Loans Payable to Bank                 $ 1,500.0
Percentage of debt repayment in next twelve months       5.00%          
Percentage of debt repayment in second year         5.00%        
Debt Instrument, Maturity Date Apr. 01, 2019 Oct. 01, 2018 Apr. 01, 2018 Apr. 01, 2017          
Percentage of debt repayment in third year 45.00% 45.00%              
Repayments of Debt           $ 1,100.0      
Debt Instrument, Interest Rate, Stated Percentage           2.31%