Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, impairment charge	$ 848.4	$ 392.3
Total, impairment charge	1,027.1	532.0	92.5
Goodwill, net book value	1,436.4	2,222.1	2,526.8
Other intangible assets, net book value	364.8	572.2
Total assets	7,262.7	8,281.7	9,083.2
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used, impairment charge	8.0	14.7	2.2
Long-lived assets held for sale or disposal, impairment charge	15.6	34.3	2.2
Goodwill, impairment charge	848.4	392.3	61.0
Other intangible assets, impairment charge	158.0	90.7	26.9
Total, impairment charge	1,030.0	532.0	92.3
Long-lived assets held and used, net book value	8.5	61.3	2.7
Long-lived assets held for sale or disposal, net book value	6.3	11.7	3.5
Goodwill, net book value	18.1		102.7
Other intangible assets, net book value	3.1	2.1
Total assets	36.0	75.1	108.9
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used, fair value measurement	9.8	68.8	3.0
Long-lived assets held for sale or disposal, fair value measurement	16.4	12.8	3.6
Goodwill, fair value measurement	18.1		102.7
Other intangible assets, fair value measurement	3.1	2.2
Total, fair value measurement	$ 47.4	$ 83.8	$ 109.3