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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Letters of credit, amount outstanding $ 45.9  
Commercial paper, maximum aggregate amount outstanding permitted 300.0  
Commercial paper, amount outstanding 298.5 $ 0.0
6.75% Senior Notes Due 2018 [Member]    
Debt Instrument [Line Items]    
Senior notes $ 397.5 397.1
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 800.0 1,110.0
Revolving credit facilities letter of credit sublimit 200.0  
Additional borrowing capacity under the revolving credit facility $ 954.1  
Commitment fee on undrawn amounts 0.20%  
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  
Basis spread on variable interest rates 1.50%  
Mortgage Facility [Member]    
Debt Instrument [Line Items]    
Mortgage facility [1] $ 180.7 185.5
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 $ 101.9 $ 85.8
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Weighted-average annual interest rate 0.85%  
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 13 days  
[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.