Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments Due	$ 220.9
Future Minimum Lease Payments Due Within Twelve Months	56.8
Future Minimum Lease Payments Due Within Two Years	40.1
Future Minimum Lease Payments Due Within Three Years	21.4
Future Minimum Lease Payments Due Within Four Years	19.9
Future Minimum Lease Payments Due Within Five Years	16.9
Future Minimum Lease Payments Due Thereafter	65.8
Rental Expense	42.5	$ 44.2	$ 44.1
Total Unfunded Commitments	$ 291.5