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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instruments [Abstract]    
Long-term debt $ 1,767.1 $ 2,128.4
Less: current maturities (13.4) (25.0)
Long-term debt, net of current maturities 1,753.7 2,103.4
Senior Notes at Six Point Seven Five Percent due 2018 [Member]    
Debt Instruments [Abstract]    
Senior notes 397.9 397.1
Senior Notes at Five Point Five Percent Due 2020 [Member]    
Debt Instruments [Abstract]    
Senior notes 350.0 350.0
Senior Notes at Three Point Three Five Percent Due 2021 [Member]    
Debt Instruments [Abstract]    
Senior notes 300.0 0.0
Senior Notes at Four Point Five Percent Due 2025 [Member]    
Debt Instruments [Abstract]    
Senior notes 448.5 0.0
Revolving Credit Facility Due 2019 [Member]    
Debt Instruments [Abstract]    
Revolving credit facility 0.0 1,110.0
Mortgage Facility [Member]    
Debt Instruments [Abstract]    
Mortgage facility [1] 175.7 185.5
Mortgage Facility [Member] | Secured Debt [Member]    
Debt Instruments [Abstract]    
Monthly principal and interest payments on mortgage facility 1.7  
Balloon payment for mortgage 155.4  
Capital Leases and Other Debt [Member]    
Debt Instruments [Abstract]    
Capital leases and other debt $ 95.0 $ 85.8
[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.