Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Comprehensive income (loss):
Net income	$ 76.4	$ 83.2	$ 72.0	$ 118.3
Other comprehensive income (loss), before tax:
Cumulative translation adjustment	(29.0)	(40.4)	(49.2)	(16.1)
Derivative financial instruments	7.8	(3.6)	16.3	(3.0)
Accrued benefit cost	1.8	1.5	3.7	3.3
Unrealized gain (loss) on investment		(1.5)	0.2
Total other comprehensive income (loss), before tax	(19.4)	(44.0)	(29.0)	(15.8)
Income tax (provision) benefit related to other comprehensive income (loss)	(3.4)	1.4	(6.9)	(0.4)
Comprehensive income	$ 53.6	$ 40.6	$ 36.1	$ 102.1