Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Dividend Declared [Member]
Components of Accumulated Other Comprehensive Income [Abstract]
Foreign currency translation	$ 227.1	$ 239.5
Translation loss on net investment hedge, net of income taxes of $(36.1) and $(36.7), respectively	(59.7)	(60.6)
Translation loss on long-term intercompany loans	(56.9)	(73.6)
Unrealized gain on investments, net of income taxes of $2.9 and $1.6, respectively	13.0	11.5
Defined benefit pension plans, net of income taxes of $(21.2) and $(21.8), respectively	(38.0)	(39.7)
Retiree health care plan, net of income taxes of $2.5 and $2.7, respectively	4.7	5.1
Accumulated other comprehensive income	90.2	82.2
Translation loss on net investment hedge, income tax benefit	(36.1)	(36.7)
Unrealized gain on investments, income taxes	2.9	1.6
Defined benefit pension plans, income tax benefit	(21.2)	(21.8)
Retiree health care plan, income taxes	$ 2.5	$ 2.7
Semi-Annual Cash Dividend [Line Items]
Dividend declaration date			Apr. 29, 2014
Dividend paid (in dollars per share)			$ 0.49
Dividends payable, date paid			Jun. 16, 2014
Dividends payable, date of record			Jun. 02, 2014