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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 21, 2015
Aug. 04, 2015
May. 22, 2015
Dec. 31, 2014
Debt Instrument [Line Items]          
Debt Issuance Cost $ 6.7        
Letters of credit, amount outstanding 45.9        
Commercial paper, maximum aggregate amount outstanding permitted     $ 1,000.0 $ 300.0  
Commercial paper, amount outstanding 435.0       $ 0.0
3.35% Senior Notes due 2021 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 300.0       0.0
3.35% Senior Notes due 2021 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Aggregate principal amount   $ 300.0      
Percentage interest on debt instrument 3.35%        
Senior notes offering price as percentage of the aggregate principal   99.998%      
Debt instrument, maturity date Jan. 15, 2021        
4.5% Senior Notes due 2025 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 448.5       0.0
4.5% Senior Notes due 2025 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Aggregate principal amount   $ 450.0      
Percentage interest on debt instrument 4.50%        
Senior notes offering price as percentage of the aggregate principal   99.663%      
Debt instrument, maturity date Oct. 01, 2025        
6.75% Senior Notes Due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 397.7       397.1
6.75% Senior Notes Due 2018 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Percentage interest on debt instrument 6.75%        
Debt instrument, maturity date Apr. 15, 2018        
5.5% Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 350.0       350.0
5.5% Senior Notes Due 2020 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Percentage interest on debt instrument 5.50%        
Debt instrument, maturity date Feb. 01, 2020        
Revolving Credit Facility Due 2019 [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity under revolving credit facility $ 1,800.0        
Additional borrowing capacity under accordion feature of revolving credit facility 500.0        
Revolving credit facility, amount outstanding 0.0       1,110.0
Revolving credit facilities letter of credit sublimit 200.0        
Additional borrowing capacity under the revolving credit facility 1,800.0        
Borrowing capacity limited under the maximum consolidated leverage ratio $ 1,600.0        
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        
Impact on credit spread from increase in leverage ratio 0.125%        
Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date Dec. 03, 2019        
Mortgage Facility [Member]          
Debt Instrument [Line Items]          
Mortgage facility [1] $ 178.2       185.5
Mortgage Facility [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date Nov. 30, 2017        
Mortgage facility, fixed interest rate 5.864%        
Number of years of mortgage loans 10 years        
Monthly principal and interest payments on mortgage facility $ 1.7        
Balloon payment for mortgage 155.4        
Capital Leases and Other Debt [Member]          
Debt Instrument [Line Items]          
Capital leases and other debt $ 95.7       $ 85.8
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%        
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Weighted-average annual interest rate 0.83%        
Commercial Paper [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Maturity period of debt 397 days        
Commercial Paper [Member] | Weighted Average [Member]          
Debt Instrument [Line Items]          
Maturity period of debt 11 days        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 1.25%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 1.625%        
Base Rate [Member] | Minimum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 0.25%        
Base Rate [Member] | Maximum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates 0.625%        
[1] The mortgage facility requires monthly principal and interest payments of $1.7 million based on a fixed amortization schedule with a balloon payment of $155.4 million due November 2017.