Shareholders' Equity - Reclassifications Out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ (136.0)	$ (117.3)	$ (375.4)	$ (349.6)
Cost of sales	493.3	457.1	1,376.9	1,285.7
Income tax (expense) benefit	(38.3)	(64.6)	(119.0)	(171.0)
Net income	246.8	238.6	656.9	654.5
Net of tax	(6.7)	(5.1)	(18.1)	(9.4)
Reclassification out of accumulated other comprehensive income | Accumulated net gain (loss) from cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(9.4)	(7.3)	(24.2)	(14.2)
Income tax (expense) benefit	2.5	1.9	6.3	3.7
Net income	(6.9)	(5.4)	(17.9)	(10.5)
Reclassification out of accumulated other comprehensive income | Amortization of prior service credits (costs)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.7	0.7	2.1	2.2
Reclassification out of accumulated other comprehensive income | Amortization of actuarial gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(0.3)	(0.1)	(0.8)	(0.3)
Reclassification out of accumulated other comprehensive income | Accumulated defined benefit plans adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.4	0.6	1.3	1.9
Income tax (expense) benefit	(0.2)	(0.3)	(1.5)	(0.8)
Net of tax	0.2	0.3	(0.2)	1.1
Reclassification out of accumulated other comprehensive income | Interest rate derivative contracts | Accumulated net gain (loss) from cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	(8.2)	(5.9)	(23.1)	(15.3)
Reclassification out of accumulated other comprehensive income | Forward-currency contracts | Accumulated net gain (loss) from cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (1.2)	$ (1.4)	$ (1.1)	$ 1.1