Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Provision [Line Items]
Current Federal Tax Expense (Benefit)	$ 126.6	$ 103.0	$ 24.5
Current State and Local Tax Expense (Benefit)	39.0	18.8	5.9
Current Foreign Tax Expense (Benefit)	86.8	19.4	19.2
Current Income Tax Expense (Benefit)	252.4	141.2	49.6
Deferred Income Taxes and Tax Credits	33.4	(7.2)	39.3
Income Tax Expense (Benefit) - including discontinued operations	285.8	134.0	88.9
Income tax expense from discontinued operations	(0.2)	55.8	(0.2)
Income Tax Expense (Benefit)	286.0	78.2	89.1
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 480.4	$ 186.2	$ 163.3