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Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Feb. 29, 2016
Dec. 31, 2015
Short-term borrowings and current maturities of long-term debt $ 361.2     $ 504.2
Repayments of Long-term Debt 0.0 $ 23.7    
Line of credit facility, amount outstanding 2,000.0      
Debt Instrument, Fair Value Disclosure 4,600.0     4,500.0
Five Year Revolving Credit Facility Refinanced [Member]        
Line of credit facility, amount outstanding 2,000.0      
Five Year Revolving Credit Facility [Member]        
Line of credit facility, amount outstanding 1,000.0      
Debentures With Put Feature [Member]        
Short-term borrowings and current maturities of long-term debt $ 343.0     $ 343.0
Debt Instrument, Maturity Date Range, Start Jan. 01, 2027      
Debt instrument, maturity date range, end Dec. 31, 2028      
Debentures with put option available to be exercised     $ 37.2  
2.875% Senior notes due 2019 [Member]        
Debt Instrument, Interest Rate, Stated Percentage 2.875%     2.875%
4.25% Senior notes due 2023 [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.25%     4.25%
5.75% Senior notes due 2043 [Member]        
Debt Instrument, Interest Rate, Stated Percentage 5.75%     5.75%
Two Point Six Two Five Percent Senior Notes Due Two Thousand Twenty [Member]        
Debt Instrument, Interest Rate, Stated Percentage 2.625%     2.625%
Three Point Five Five Percent Senior Notes due 2024 [Member]        
Debt Instrument, Interest Rate, Stated Percentage 3.55%     3.55%
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.65%     4.65%