Non-operating Income (Expense) Disclosure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Nonoperating Income (Expense) [Abstract]
Interest Expense	$ 32.0	$ 29.9	$ 36.2
Amortization of financing costs and discounts	(1.1)	(1.2)	(1.4)
Capitalized interest	1.9	1.3	1.6
Interest expense, net of capitalized interest	(31.2)	(29.8)	(36.0)
Investment Income	4.9	5.5	9.4
SERP market adjustments	(0.5)	0.0	0.9
Investment income	4.4	5.5	10.3
Foreign currency losses	(5.3)	(3.1)	(5.3)
Gain on acquisition of joint venture	0.0	0.0	35.9
Gain on sale of joint venture	0.0	0.0	1.2
Loss on early debt extinguishment	0.0	0.0	(2.3)
Other Nonoperating Income (Expense)	(5.3)	(3.1)	29.5
Total non-operating income (expense)	$ (32.1)	$ (27.4)	$ 3.8