Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			6 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 1st Semi-Annual Dividend Declared in 2014 [Member]	Sep. 30, 2014 1st Semi-Annual Dividend Declared in 2014 [Member]	Oct. 29, 2014 2nd Semi-Annual Dividend Declared in 2014 [Member] Subsequent Event [Member]	Sep. 30, 2014 2nd Semi-Annual Dividend Declared in 2014 [Member] Subsequent Event [Member]	Sep. 30, 2014 Defined Benefit Pension Plans [Member]	Dec. 31, 2013 Defined Benefit Pension Plans [Member]	Sep. 30, 2014 Retiree Health Care Plan [Member]	Dec. 31, 2013 Retiree Health Care Plan [Member]
Components of Accumulated Other Comprehensive Income [Abstract]
Foreign currency translation	$ 74.5	$ 239.5
Translation loss on net investment hedge, net of income taxes of $(23.0) and $(36.7), respectively	(36.2)	(60.6)
Translation loss on long-term intercompany loans	(65.2)	(73.6)
Unrealized gain on investments, net of income taxes of $3.3 and $1.6, respectively	14.9	11.5
Defined benefit pension plans and retiree health care plans, net of income taxes							(37.4)	(39.7)	4.6	5.1
Accumulated other comprehensive (loss) income	(44.8)	82.2
Translation loss on net investment hedge, tax	(23.0)	(36.7)
Unrealized gain on investments, tax	3.3	1.6
Defined benefit pension plans and retiree health care plans, tax							$ (21.0)	$ (21.8)	$ 2.4	$ 2.7
Semi-Annual Cash Dividend [Line Items]
Dividend declaration date				Apr. 29, 2014		Oct. 29, 2014
Dividend paid (in dollars per share)			$ 0.49
Dividend declared (in dollars per share)					$ 0.49
Dividends payable, date paid				Jun. 16, 2014		Dec. 15, 2014
Dividends payable, date of record				Jun. 02, 2014		Dec. 01, 2014