Income Taxes - (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Income Taxes [Abstract]
Federal income tax expense	$ 24.7	$ 17.6
Foreign income tax expense	17.9	17.7
Foreign income permanently reinvested	5.6	10.3
Effective Income Tax Rate Reconciliation, Deduction, Amount	4.4
Estimated taxes payable on undistributed earnings	14.9
Liability for uncertain tax positions	$ 4.8