Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Oct. 29, 2013 Dividend Declared [Member]	Apr. 30, 2013 Dividend Declared [Member]
Components of Accumulated Other Comprehensive (Loss) Income [Abstract]
Foreign currency translation	$ 239.7	$ 186.8
Translation loss on net investment hedge, net of income taxes of $(34.2) and $(31.3), respectively	(55.9)	(51.1)
Translation loss on long-term intercompany loans	(81.0)	(73.4)
Unrealized gain on investments, net of income taxes of $3.1 and $3.9, respectively	9.2	11.8
Defined benefit pension plans, net of income taxes of $(21.4) and $(22.6), respectively	(34.1)	(37.0)
Retiree health care plan, net of income taxes of $(1.6) and $(1.7), respectively	(2.6)	(2.7)
Accumulated other comprehensive income	75.3	34.4
Translation loss on net investment hedge, income tax benefit	(34.2)	(31.3)
Unrealized gain on investments, income taxes	3.1	3.9
Defined benefit pension plans, income tax benefit	(21.4)	(22.6)
Retiree health care plan, income tax benefit	$ (1.6)	$ (1.7)
Class of Stock [Line Items]
Dividend declaration date			Oct. 29, 2013	Apr. 30, 2013
Dividend declared (in dollars per share)			$ 0.46	$ 0.46
Dividends paid, Date paid			Dec. 13, 2013	Jun. 14, 2013
Dividends Payable, Date of Record			Dec. 03, 2013	Jun. 03, 2013