Financial Instruments and Fair Value Measurements - Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Derivative [Line Items]
Acquired contracts		$ 71.0
Matured or expired contracts	(319.9)
Foreign Currency Forwards [Member]
Derivative [Line Items]
Notional amounts at January 1	1,303.8
New contracts	1,050.0
Matured or expired contracts	(1,303.8)
Notional amounts at June 30	1,050.0
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amounts at January 1	1,314.8	1,496.5
New contracts		444.2
Acquired contracts		71.0
Matured or expired contracts	(1,230.2)	(456.0)
Notional amounts at June 30	84.6	1,555.7
Interest Rate Caps [Member]
Derivative [Line Items]
Notional amounts at January 1
New contracts
Acquired contracts
Matured or expired contracts
Notional amounts at June 30