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Debt Transactions (Details)
$ in Millions
3 Months Ended
Sep. 30, 2018
USD ($)
Rate
Schedule of New Debt Issuance [Line Items]  
Agreed Consideration $ 2,300.0
Bridge Loan 2,300.0
Term Loan 500.0
Senior Notes at Par Value, Disaggregated 500.0
Discount at Issuance 5.8
Repayments of Commercial Paper 800.0
Repayments of Lines of Credit $ 59.0
Debt Instrument, Redemption Price, Percentage | Rate 101.00%
Debt Instrument Change of Control Repurchase Event Price Percentage | Rate 101.00%
3.50% Notes Due 2020  
Schedule of New Debt Issuance [Line Items]  
Debt Issuance Face Amount $ 500.0
Discount at Issuance 1.0
Senior Notes Net of Discount 499.0
Debt Issuance Cost at Issuance 2.9
Senior Notes Net Proceeds 496.1
3.75% Notes Due 2021  
Schedule of New Debt Issuance [Line Items]  
Debt Issuance Face Amount 500.0
Discount at Issuance 0.3
Senior Notes Net of Discount 499.7
Senior Notes Net Proceeds 496.5
4.65% Notes Due 2028  
Schedule of New Debt Issuance [Line Items]  
Debt Issuance Face Amount 500.0
Discount at Issuance 1.7
Senior Notes Net of Discount 498.3
Senior Notes Net Proceeds 493.9
5.40% Notes Due 2048  
Schedule of New Debt Issuance [Line Items]  
Debt Issuance Face Amount 500.0
Discount at Issuance 2.8
Senior Notes Net of Discount 497.2
Senior Notes Net Proceeds 491.6
Aggregate Senior Notes Issued [Domain]  
Schedule of New Debt Issuance [Line Items]  
Debt Issuance Face Amount 2,000.0
Discount at Issuance 5.8
Senior Notes Net of Discount 1,994.2
Debt Issuance Cost at Issuance 16.1
Senior Notes Net Proceeds $ 1,978.1