Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Unrecognized tax positions, Beginning balance	$ 156.6	$ 205.4	$ 180.8
Additions for tax positions related to the current year	67.8	49.1	48.9
Additions for tax positions of prior years	6.1	18.9	15.3
Reductions for tax positions of prior years	10.1	20.6	27.3
Settlements with taxing authorities	21.4	91.5	2.1
Lapse of statute of limitations	3.4	4.7	10.2
Unrecognized tax positions,Ending balance	$ 195.6	$ 156.6	$ 205.4