Debt - Additional Information (Detail)	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 EUR (€)	Dec. 31, 2016
Debt Instrument [Line Items]
Consideration for repurchase of debt			$ 897,000,000
Loss related to extinguishment of debt/credit facility			(27,800,000)	$ (32,300,000)	$ (47,100,000)
Other comprehensive income (loss), foreign currency transaction and translation gain (loss) arising during period, net of tax				$ (14,000,000)
Tender Offers [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount			1,060,000,000
6.25% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount			$ 63,000,000
Senior notes rate	6.25%		6.25%				6.25%
Consideration for repurchase of debt	$ 195,000,000
Loss related to extinguishment of debt/credit facility		$ 4,500,000
Debt Instrument, face amount	$ 187,000,000
2.60% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount			$ 733,000,000
Senior notes rate			2.60%	2.60%		2.60%	2.60%
3.75% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes rate				3.75%		3.75%	3.75%
Debt Instrument, face amount | €						€ 300,000,000
Debt Instrument, maturity date				Oct. 01, 2021
4.70% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount			$ 76,000,000
Senior notes rate			4.70%	4.70%		4.70%	4.70%
Debt Instrument, face amount				$ 277,000,000