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DEBT - SENIOR NOTES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Aug. 23, 2012
Oct. 28, 2010
Dec. 31, 2012
Revolving Credit Facility [Member]
Aug. 23, 2012
Senior notes due 2017 [Member]
Aug. 23, 2012
Senior notes due 2022 [Member]
Dec. 31, 2012
Senior notes due 2016 [Member]
Dec. 31, 2011
Senior notes due 2016 [Member]
Dec. 31, 2010
Senior notes due 2016 [Member]
Dec. 31, 2010
Combined Senior notes due 2016 and 2020 [Member]
Dec. 31, 2012
Combined Senior notes due 2016 and 2020 [Member]
Dec. 31, 2012
Senior notes due 2020 [Member]
Dec. 31, 2012
Senior notes due 2020 [Member]
Dec. 31, 2010
Senior notes due 2020 [Member]
Dec. 31, 2012
Senior notes due 2013 [Member]
Dec. 31, 2012
Senior notes due 2015 [Member]
Debt Instrument [Line Items]                                
Senior Notes, Noncurrent   $ 1,000.0     $ 500.0 $ 500.0                    
Interest rate (in hundredths)         2.20% 3.75% 3.125%   3.125%     4.625% 4.625% 4.625% 5.50% 5.625%
Repayments of Lines of Credit       625.0                        
Bridge term loan credit agreement, maximum borrowing capacity     925.0                          
Debt offering closing date                 November 19, 2010              
Face amount             325.0   325.0 925.0 925.0 600.0 600.0 600.0    
Maturity date May 15, 2016           May 15, 2016   May 15, 2016     Nov. 15, 2020 Nov. 15, 2020 Nov. 15, 2020 Jan. 31, 2013  
Remaining quarterly principal payments date range, start               May 15, 2011                
Net proceeds from debt offerings                   $ 915.4            
Periodic payments, frequency                             semi-annually semi-annually