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Debt and Credit Facilities (Long-Term Debt Excluding Current Maturities) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Long-term debt excluding current maturities $ 3,708.9 $ 3,713.6
6.875% Senior Notes Due 2018 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 6.875% 6.875%
Long-term debt excluding current maturities $ 748.4 $ 748.0
2.875% Senior notes due 2019 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.875% 2.875%
Long-term debt excluding current maturities $ 348.6 $ 348.1
Two Point Six Two Five Percent Senior Notes Due Two Thousand Twenty [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.625% 2.625%
Long-term debt excluding current maturities $ 298.3 $ 298.0
9.00% Debentures Due 2021 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 9.00% 9.00%
Long-term debt excluding current maturities $ 124.8 $ 124.8
4.25% Senior notes due 2023 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25%
Long-term debt excluding current maturities $ 695.5 $ 695.0
Seven Point Two Zero Percent Debentures [Domain]    
Long-term debt excluding current maturities $ 59.7 $ 67.1
Three Point Five Five Percent Senior Notes due 2024 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.55% 3.55%
Long-term debt excluding current maturities $ 494.3 $ 493.7
6.48% Debentures Due 2025 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 6.48% 6.48%
Long-term debt excluding current maturities $ 149.7 $ 149.7
5.75% Senior notes due 2043 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 5.75% 5.75%
Long-term debt excluding current maturities $ 493.5 $ 493.4
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.65% 4.65%
Long-term debt excluding current maturities $ 295.4 $ 295.2
Other Loans and Notes [Member]    
Long-term debt excluding current maturities $ 0.7 $ 0.6
Seven Point Two Zero Percent Debentures due Two Thousand Fourteen to Two Thousand Twenty Five [Member] [Member]    
Debt Instrument, Interest Rate, Stated Percentage 7.20% 7.20%