Income Taxes Income Taxes Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense at 35%	$ 18.0	$ 16.2	$ 58.8	$ 41.9
Uncertain tax positions	(7.5)	(0.8)	0.6	0.2
Foreign tax credits from amending prior returns	(1.0)	0.0	(30.4)	0.0
Tax benefits on certain foreign investments	0.0	(5.1)	0.0	(10.5)
Changes in valuation allowances	0.4	3.5	0.4	7.5
Tax settlements	0.0	0.0	0.0	(4.0)
Other, net	(3.0)	0.3	(3.0)	(7.7)
Income Tax Expense	$ 6.9	$ 14.1	$ 26.4	$ 27.4
Effective Income Tax Rate	13.40%	30.40%	15.70%	22.90%