Reclassification out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax	$ 6.1	$ (2.6)	$ 7.5	$ (0.4)
Gains (losses) on cash flow hedges - Tax	(2.8)	0.9	(3.3)	0.1
Gains on cash flow hedges - Net of Tax	3.3	(1.7)	4.2	(0.3)
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(1.9)	(2.3)	(4.3)	(4.9)
Amortization of actuarial losses and prior service costs included in net income - Tax	0.8	0.9	1.7	1.9
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(1.1)	(1.4)	(2.6)	(3.0)
Income Loss Attributable to Reclassification Out Of AOCI Net Of Tax	2.2	(3.1)	1.6	(3.3)
Operating Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(1.2)	(1.5)	(2.7)	(3.1)
SG&A Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(0.7)	(0.8)	(1.6)	(1.8)
Cross-Currency Swap [Member] | Other Nonoperating Income (Expense) [Member]
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax	7.1	$ (2.6)	8.6	$ (0.4)
Interest Rate Contract [Member] | Interest Expense [Member]
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax	$ (1.0)		$ (1.1)