Assets Measured at Fair Value on a Nonrecurring Basis (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total, impairment charge			$ 9.7	$ 7.8
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	(0.3)	0.3	3.2	0.8
Long-lived assets held for sale or disposal, impairment charge	2.8	3.4	5.9	7.6
Other intangible assets	1.0		1.0
Total, impairment charge	3.5	3.7	10.1	8.4
Long-lived assets held and used, net book value	4.7	0.5	4.7	0.5
Long-lived assets held for sale or disposal, net book value	7.5	12.1	7.5	12.1
Total Assets	12.2	12.6	12.2	12.6
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	2.8	0.3	4.8	0.6
Long-lived assets held for sale or disposal, fair value measurement		12.2	7.9	13.9
Total, fair value measurement	$ 2.8	$ 12.5	$ 12.7	$ 14.5