Accumulated Other Comprehensive Income (Loss) - Detail of Amount Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Tax (expense) benefit	$ (14.8)	$ (32.9)	$ (48.9)	$ (43.1)
Net earnings available to common stockholders	28.1	60.1	125.3	131.0
Other income (expense) , net	7.0	(4.8)	12.9	(4.4)
Interest expenses	59.0	73.9	117.5	152.4
Total reclassifications for the period			3.6	(4.0)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Total reclassifications for the period	(4.3)	(3.5)	3.6	(4.0)
Unrecognized Pension Items
Accumulated Other Comprehensive Income Loss [Line Items]
Total reclassifications for the period			(4.8)	(4.8)
Unrecognized Pension Items | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Prior service costs	0.2	0.1	0.4	0.2
Actuarial losses	(2.8)	(2.5)	(5.8)	(5.0)
Settlement/curtailment loss	(0.1)	(0.5)	(0.4)	(1.0)
Total pre-tax amount	(2.7)	(2.9)	(5.8)	(5.8)
Tax (expense) benefit	0.5	0.3	1.0	1.0
Net earnings available to common stockholders	(2.2)	(2.6)	(4.8)	(4.8)
Net Gains (Losses) on Cash Flow Hedging Derivatives | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Total pre-tax amount	(3.5)	(1.1)	12.4	1.3
Tax (expense) benefit	1.4	0.2	(4.0)	(0.5)
Net earnings available to common stockholders	(2.1)	(0.9)	8.4	0.8
Foreign Currency Forward Contracts [Member] | Net Gains (Losses) on Cash Flow Hedging Derivatives | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Other income (expense) , net	2.9	$ (1.1)	3.7	1.2
Interest Rate Swaps [Member] | Net Gains (Losses) on Cash Flow Hedging Derivatives | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Interest expenses	(6.5)		8.6
Treasury Lock | Net Gains (Losses) on Cash Flow Hedging Derivatives | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Interest expenses	$ 0.1		$ 0.1	$ 0.1