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Non-operating Income (Expense) Disclosure (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nonoperating Income (Expense) [Abstract]      
Interest Expense $ (20.6) $ (32.9) $ (32.0)
Amortization of financing costs and discounts (0.9) (1.1) (1.1)
Capitalized Interest 2.2 1.9 1.9
Interest expense, net of capitalized interest (19.3) (32.1) (31.2)
Investment Income 9.5 8.0 4.9
SERP market adjustments 1.0 0.2 (0.5)
Investment income 10.5 8.2 4.4
Foreign currency losses (4.4) 2.1 (5.3)
Loss on early debt extinguishment 0.0 (17.3) 0.0
Other Nonoperating Income (Expense) (4.4) (15.2) (5.3)
Total non-operating income (expense) $ (13.2) $ (39.1) $ (32.1)