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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Long-term debt $ 1,754.5 $ 1,757.0
Less: current maturities (11.9) (11.7)
Long-term debt, net of current maturities 1,742.6 1,745.3
6.75% Senior Notes Due 2018 [Member]    
Senior notes 397.8 397.5
5.5% Senior Notes Due 2020 [Member]    
Senior notes 346.7 346.5
3.35% Senior Notes due 2021 [Member]    
Senior notes 297.7 297.6
4.5% Senior Notes due 2025 [Member]    
Senior notes 444.8 444.7
Revolving Credit Facility Due 2019 [Member]    
Revolving credit facility 0.0 0.0
Mortgage Facility [Member]    
Mortgage facility [1] 173.2 175.7
Capital Leases and Other Debt [Member]    
Capital leases and other debt 94.3 $ 95.0
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.