Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net earnings available to common stockholders	$ 60.3	$ 56.3	$ 132.1	$ 59.0
Other comprehensive income (loss), net of taxes:
Recognition of deferred pension items, net of taxes of $(0.3) for the three months ended June 30, 2014, $(0.2) for the three months ended June 30, 2013, zero for the six months ended June 30, 2014 and $(1.7) for the six months ended June 30, 2013	0.6	0.9	2.4	6.0
Foreign currency translation adjustments	20.7	(95.2)	23.1	(117.1)
Unrealized (losses) gains on derivative instruments, net of taxes of $0.4 for the three months ended June 30, 2014, $1.0 for the three months ended June 30, 2013, $1.2 for the six months ended June 30, 2014 and $1.5 for the six months ended June 30, 2013	(1.7)	3.2	(3.4)	3.3
Comprehensive income (loss), net of taxes	$ 79.9	$ (34.8)	$ 154.2	$ (48.8)