v3.8.0.1
Financing Minimum Principle Payments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principle due prior to 2019 $ 0  
Principle due in 2019 800,000,000  
Principle due in 2020 0  
Principle due in 2021 750,000,000  
Principle due thereafter 1,572,400,000  
Long-term debt [1] 3,122,400,000  
Debt discounts, premiums and issuance costs 18,200,000 $ 20,100,000
Long-term Debt 4,056,200,000 3,358,000,000
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Long-term Debt 948,600,000  
Term Loan [Member]    
Debt Instrument [Line Items]    
Principle due in 2019 500,000,000  
Principle due in 2020 0  
Principle due in 2021 0  
Principle due thereafter 122,400,000  
Long-term debt [1] 622,400,000  
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principle due in 2019 300,000,000  
Principle due in 2020 0  
Principle due in 2021 750,000,000  
Principle due thereafter 1,450,000,000  
Long-term debt [1] 2,500,000,000  
Other Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 3,400,000 $ 3,300,000
[1] Not included in the table above are net discounts, premiums and issuance costs associated with the Registered Notes, which totaled $18.2 million as of December 31, 2017, and have been recorded as an offset to the carrying amount of the related debt in the accompanying Consolidated Balance Sheet as of December 31, 2017. In addition, the table above does not include principal balances of $948.6 million under the Commercial Paper Programs and other financing balances of $3.4 million.