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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Long-term debt $ 1,830.1 $ 2,128.4
Less: current maturities (24.6) (25.0)
Long-term debt, net of current maturities 1,805.5 2,103.4
6.75% Senior Notes Due 2018 [Member]    
Senior notes 397.5 397.1
5.5% Senior Notes Due 2020 [Member]    
Senior notes 350.0 350.0
Revolving Credit Facility Due 2019 [Member]    
Revolving credit facility 800.0 1,110.0
Mortgage Facility [Member]    
Mortgage facility [1] 180.7 185.5
Capital Leases and Other Debt [Member]    
Capital leases and other debt 101.9 $ 85.8
Secured Debt [Member] | Mortgage Facility [Member]    
Monthly principal and interest payments on mortgage facility 1.7  
Balloon payment for mortgage $ 155.4  
[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.