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Long -Term Debt - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 07, 2018
Nov. 07, 2012
Feb. 14, 2012
Jun. 30, 2020
Jun. 30, 2019
Long Term Debt (Additional Textual) [Abstract]          
Long-term Debt, Maturities, Repayments of Principal in 2022       $ 300.0  
Future Principal Maturities of Long-term Debt in 2028       $ 300.0  
US Dollar Denominated Borrowings [Member]          
Long-Term Debt (Textual) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage       0.00% 0.00%
Capital Lease Obligations [Member]          
Long-Term Debt (Textual) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage       0.00%  
4.625% Senior Unsecured Notes Due in 2028          
Long-Term Debt (Textual) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 4.625%        
Debt Instrument, Unamortized Discount       $ 0.0 $ 2.0
Long Term Debt (Additional Textual) [Abstract]          
Proceeds from Issuance of Senior Long-term Debt $ 300.0        
2.650% Senior Notes due 2020 [Member]          
Long-Term Debt (Textual) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage   2.65%      
Debt Instrument, Unamortized Discount       0.0 0.0
Long Term Debt (Additional Textual) [Abstract]          
Proceeds from Issuance of Senior Long-term Debt   $ 400.0      
3.875% Senior Unsecured Notes Due in 2022 [Member]          
Long-Term Debt (Textual) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage     3.875%    
Debt Instrument, Unamortized Discount       0.0 0.1
Long Term Debt (Additional Textual) [Abstract]          
Proceeds from Issuance of Senior Long-term Debt     $ 300.0    
Twenty Eighteen Credit Agreement [Member] [Domain]          
Long-Term Debt (Textual) [Abstract]          
Maximum Borrowing Capacity under the 2018 Credit Agreement $ 700.0        
Borrowing outstanding under 2018 Credit Agreement       $ 500.0 $ 0.0
Term of Long Term Debt       5 years