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Non-operating Income (Expense) Disclosure (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nonoperating Income (Expense) [Abstract]      
Interest Expense $ (54.4) $ (60.8) $ (71.7)
Amortization of debt charges (2.6) (3.1) (3.0)
Capitalized interest 0.1 0 0.1
Interest expense, net of capitalized interest (56.9) (63.9) (74.6)
Investment income 13.3 18.0 26.0
Realized gains from the sale of investments 15.2 19.0 18.7
SERP marketing adjustments 0.2 1.4 3.0
Investment income 28.7 38.4 47.7
Other than temporary impairment (14.8) (17.0) (2.0)
Foreign currency gain (losses) (1.0) 2.2 13.4
Early debt extinguishment 0 0 20.7
Other Non-operating expense (1.0) 2.2 (7.3)
Total non-operating income (expense) $ (44.0) $ (40.3) $ (36.2)