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Long-Term Debt Long-Term Debt - 2017 Senior Notes (Details) - Senior notes - Senior Notes Indenture 2017 - USD ($)
$ in Millions
Feb. 17, 2017
Jun. 30, 2017
May 17, 2017
Debt Instrument [Line Items]      
Aggregate principal amount of debt issued   $ 1,500.0  
Stated interest rate   4.25%  
Maturity Dates May 15, 2024    
Debt issuance costs, net     $ 12.6