Accumulated Other Comprehensive Income (Loss) - Detail of Amount Reclassified from Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Total pre-tax amount	$ 131.3	$ 81.1
Tax (expense) benefit	(34.1)	(10.2)
Net earnings available to common stockholders	97.2	70.9
Other income, net	5.4
Interest expenses	58.5	78.5
Total reclassifications for the period	8.2	(0.5)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Total reclassifications for the period	8.2	(0.5)
Unrecognized Pension Items
Accumulated Other Comprehensive Income Loss [Line Items]
Total reclassifications for the period	(2.4)	(2.2)
Unrecognized Pension Items | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Prior service costs	0.2	0.1
Actuarial losses	(3.0)	(2.5)
Settlement/curtailment loss	(0.3)	(0.5)
Total pre-tax amount	(3.1)	(2.9)
Tax (expense) benefit	0.7	0.7
Net earnings available to common stockholders	(2.4)	(2.2)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Total pre-tax amount	16.0	2.4
Tax (expense) benefit	(5.4)	(0.7)
Net earnings available to common stockholders	10.6	1.7
Foreign Currency Forward Contracts [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Other income, net	0.8	2.3
Interest Rate Swaps [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Interest expenses	15.1
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Interest expenses	$ 0.1	$ 0.1