Non-operating Income (Expense) Disclosure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Nonoperating Income (Expense) [Abstract]
Interest Expense	$ (32.9)	$ (32.0)	$ (29.9)
Amortization of financing costs and discounts	(1.1)	(1.1)	(1.2)
Interest Costs Capitalized Adjustment	1.9	1.9	1.3
Interest expense, net of capitalized interest	(32.1)	(31.2)	(29.8)
Investment Income	8.0	4.9	5.5
SERP market adjustments	0.2	(0.5)	0.0
Investment income	8.2	4.4	5.5
Foreign currency losses	2.1	(5.3)	(3.1)
Loss on early debt extinguishment	(17.3)	0.0	0.0
Other Nonoperating Income (Expense)	(15.2)	(5.3)	(3.1)
Total non-operating income (expense)	$ (39.1)	$ (32.1)	$ (27.4)