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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Long-term debt $ 1,787.6 $ 1,789.4
Less: unamortized debt discounts and debt issuance costs (9.5) (10.8)
Less: current maturities (562.0) (167.5)
Long-term debt, net of current maturities $ 1,216.1 1,611.1
6.75% Senior Notes Due 2018 [Member] | Senior Notes [Member]    
Percentage interest on debt instrument (percent) 6.75%  
Senior notes $ 400.0 400.0
5.5% Senior Notes Due 2020 [Member] | Senior Notes [Member]    
Percentage interest on debt instrument (percent) 5.50%  
Senior notes $ 350.0 350.0
3.35% Senior Notes due 2021 [Member] | Senior Notes [Member]    
Percentage interest on debt instrument (percent) 3.35%  
Senior notes $ 300.0 300.0
4.5% Senior Notes due 2025 [Member] | Senior Notes [Member]    
Percentage interest on debt instrument (percent) 4.50%  
Senior notes $ 450.0 450.0
Revolving Credit Facility Due 2019 [Member]    
Revolving credit facility 0.0 0.0
Mortgage Facility [Member]    
Mortgage facility [1] 148.2 153.2
Mortgage Facility [Member] | Secured Debt [Member]    
Monthly principal and interest payments on mortgage facility 1.6  
Balloon payment for mortgage 143.9  
Capital Leases and Other Debt [Member]    
Capital leases and other debt $ 139.4 $ 136.2
[1] 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.