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Non-operating Income (Expense) Disclosure (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nonoperating Income (Expense) [Abstract]                      
Interest Expense                 $ 36.2 $ 48.0 $ 54.4
Amortization of financing costs and discounts                 1.4 1.5 2.6
Capitalized interest                 1.6 0.2 (0.1)
Interest expense, net of capitalized interest 8.0 7.6 9.8 10.6 12.9 10.7 13.1 12.6 36.0 49.3 56.9
Investment Income                 9.4 13.0 13.3
Realized gains from the sale of investments                 0 0 15.2
SERP market adjustments                 0.9 1.8 0.2
Investment income 2.0 1.7 3.1 3.5 3.1 4.1 3.4 4.2 10.3 14.8 28.7
Other-than-temporary impairment of investments                 0 0 14.8
Foreign currency losses                 (5.3) (2.7) (1.0)
Gain on settlement of litigation related to ARS         (20.0)       0 20.0 0
Gain on acquisition of joint venture                 35.9 0 0
Gain on sale of joint venture                 1.2 0 0
Loss on early debt extinguishment             (52.2)   (2.3) (52.2) 0
Other non-operating income (expense)                 (29.5) 34.9 1.0
Nonoperating Income (Expense) $ (2.3) $ 0.2 $ 32.3 $ (0.7) $ 19.6 $ 0.4 $ (54.8) $ (0.1) $ 3.8 $ (69.4) $ (44.0)