Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Comprehensive income (loss):
Net income	$ 94.9	$ 76.9	$ 166.9	$ 195.2
Other comprehensive income (loss), before tax:
Cumulative translation adjustment	27.3	25.6	(21.9)	9.5
Derivative financial instruments	(13.0)	(7.6)	3.3	(10.6)
Accrued benefit cost	1.9	1.5	5.6	4.8
Unrealized gain on investment	0.1	1.0	0.3	1.0
Total other comprehensive income (loss), before tax	16.3	20.5	(12.7)	4.7
Income tax (provision) benefit related to other comprehensive income (loss)	3.5	1.5	(3.4)	1.1
Comprehensive income	$ 114.7	$ 98.9	$ 150.8	$ 201.0