Divestitures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses			$ 215.0
Disposition of Business, Expenses			5.0
Gain on sale of business	$ 46.2	$ 0.0	44.9	$ 0.0
Gain on sale of business, after tax			$ 51.6
Two Point Three Seven Five Percent Notes, Due March Two Thousand Sixteen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Face Amount					$ 250.0
Debt Instrument, Interest Rate, Stated Percentage					2.375%