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Long-Term Debt and Commercial Paper (Narrative) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Nov. 02, 2017
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 19, 2017
USD ($)
Debt Instrument [Line Items]        
Letters of credit, amount outstanding   $ 49.0    
Commercial paper, maximum aggregate amount outstanding permitted   1,000.0    
Commercial paper, amount outstanding   995.0 $ 942.0  
6.75% Senior Notes Due 2018 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes   $ 400.0 400.0  
Percentage interest on debt instrument (percent)   6.75%    
Debt instrument, maturity date   Apr. 15, 2018    
5.5% Senior Notes Due 2020 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes   $ 350.0 350.0  
Percentage interest on debt instrument (percent)   5.50%    
Debt instrument, maturity date   Feb. 01, 2020    
3.35% Senior Notes due 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes   $ 300.0 300.0  
Percentage interest on debt instrument (percent)   3.35%    
Debt instrument, maturity date   Jan. 15, 2021    
4.5% Senior Notes due 2025 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes   $ 450.0 450.0  
Percentage interest on debt instrument (percent)   4.50%    
Debt instrument, maturity date   Oct. 01, 2025    
Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Credit agreement, maximum leverage ratio required   3.75    
Revolving credit facility, amount outstanding [1]   $ 82.0 0.0  
Additional borrowing capacity under the revolving credit facility   1,700.0    
Borrowing capacity limited under the maximum consolidated leverage ratio   679.0    
Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Mortgage facility, amount outstanding [2]   $ 145.7 153.2  
Mortgage Facility [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Nov. 30, 2017    
Mortgage facility, fixed interest rate (percent)   5.864%    
Number of years of mortgage loans   10 years    
Monthly principal and interest payments on mortgage facility   $ 1.6    
Balloon payment for mortgage   143.9    
Capital Leases and Other Debt [Member]        
Debt Instrument [Line Items]        
Capital leases and other debt   $ 143.7 $ 136.2  
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Weighted-average annual interest rate   1.80% 1.26%  
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   14 days 24 days  
Subsequent Event [Member] | Revolving Credit Facility Due 2022 [Member]        
Debt Instrument [Line Items]        
Credit agreement, maximum leverage ratio required       4.25
Maximum borrowing capacity under revolving credit facility       $ 1,800.0
Additional borrowing capacity under accordion feature of revolving credit facility       500.0
Revolving credit facilities letter of credit sublimit       $ 200.0
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%
Subsequent Event [Member] | Revolving Credit Facility Due 2022 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date Oct. 19, 2022      
Subsequent Event [Member] | Minimum [Member] | Revolving Credit Facility Due 2022 [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts (percent) 0.15%      
Subsequent Event [Member] | Maximum [Member] | Revolving Credit Facility Due 2022 [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts (percent) 0.25%      
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility Due 2022 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 1.25%      
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility Due 2022 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 1.625%      
Subsequent Event [Member] | Base Rate [Member] | Minimum [Member] | Revolving Credit Facility Due 2022 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 0.25%      
Subsequent Event [Member] | Base Rate [Member] | Maximum [Member] | Revolving Credit Facility Due 2022 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 0.625%      
[1] In October 2017, we amended our existing unsecured credit agreement and extended the stated termination date to October 19, 2022.
[2] The mortgage facility requires monthly principal and interest payments of $1.6 million based on a fixed amortization schedule with a balloon payment of $143.9 million due November 2017.