Fair Value of Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt	$ 1,511.0	[1]	$ 1,521.2	[1]
Long-term debt, fair value	1,625.8		1,610.3
Short-term debt	124.3	[1]	79.6	[1]
Short-term debt, fair value	124.3		79.6
U.S. Private Placement - Long-Term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt	1,423.5	[1]	1,424.2	[1]
Long-term debt, fair value	1,535.3		1,510.2
Medium-term Notes
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt	75.4	[1]	83.2	[1]
Long-term debt, fair value	78.4		86.3
Other Long-Term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt	12.1	[1]	13.8	[1]
Long-term debt, fair value	12.1		13.8
Overdrafts and Other Short-Term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Short-term debt	105.7	[1]	57.8	[1]
Short-term debt, fair value	105.7		57.8
Short-Term Portion of Long-Term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Short-term debt	18.6	[1]	21.8	[1]
Short-term debt, fair value	$ 18.6		$ 21.8

[1] Debt as reported in balance sheet.