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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Sep. 21, 2015
Aug. 04, 2015
May. 22, 2015
Dec. 31, 2014
Debt Instrument [Line Items]          
Commercial Paper Maximum Aggregate Amount     $ 1,000.0 $ 300.0  
Debt Issuance Cost $ 6.4        
Letters of credit, amount outstanding 44.1        
Commercial paper $ 599.5       $ 0.0
Credit Agreement Due 2019 [Member]          
Debt Instrument [Line Items]          
Impact on credit spread from increase in leverage ratio 0.125%        
Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date Dec. 03, 2019        
Additional borrowing capacity under accordion feature of revolving credit facility $ 500.0        
Maximum borrowing capacity under revolving credit facility 1,800.0        
Revolving credit facility, amount outstanding 0.0       1,110.0
Revolving credit facilities letter of credit sublimit 200.0        
Additional borrowing capacity under revolving credit facility 1,800.0        
Borrowing capacity limited under the maximum consolidated leverage ratio $ 1,500.0        
Leverage ratio, minimum threshold, current credit spread 2.0        
Leverage ratio, maximum threshold, current credit spread 3.25        
Leverage ratio, minimum threshold, increase in credit spread 3.25        
Senior Notes at Six Point Seven Five Percent due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 397.9       397.1
Senior Notes at Five Point Five Percent Due 2020 [Member]          
Debt Instrument [Line Items]          
Senior notes 350.0       350.0
Senior Notes at Three Point Three Five Percent Due 2021 [Member]          
Debt Instrument [Line Items]          
Senior notes 300.0       0.0
Senior Notes at Four Point Five Percent Due 2025 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 448.5       $ 0.0
Senior Notes [Member] | Senior Notes at Six Point Seven Five Percent due 2018 [Member]          
Debt Instrument [Line Items]          
Percentage interest on debt instrument 6.75%        
Debt instrument, maturity date Apr. 15, 2018        
Senior Notes [Member] | Senior Notes at Five Point Five Percent Due 2020 [Member]          
Debt Instrument [Line Items]          
Percentage interest on debt instrument 5.50%        
Debt instrument, maturity date Feb. 01, 2020        
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 300.0      
Percentage interest on debt instrument 3.35%        
Debt Instrument Percentage Aggregate Offering Price Percentage   99.998%      
Debt instrument, maturity date Jan. 15, 2021        
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 450.0      
Percentage interest on debt instrument 4.50%        
Debt Instrument Percentage Aggregate Offering Price Percentage   99.663%      
Debt instrument, maturity date Oct. 01, 2025        
Minimum [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Commitment fee on undrawn amounts 0.175%        
Maximum [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Commitment fee on undrawn amounts 0.25%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 1.25%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 1.625%        
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 0.25%        
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 0.625%        
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Short-term Debt, Weighted Average Interest Rate 0.92%        
Commercial Paper [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Term 397 days        
Commercial Paper [Member] | Weighted Average [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Term 20 days