Fair Value Measurement - Assets Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-lived assets held for sale or disposal, impairment charge	$ 6.2	$ 14.0	$ 17.6
Goodwill, impairment charge	18.0	18.1
impairment of intangible assets	11.9
Total, impairment charge	36.5	47.3	21.5
Goodwill	1,743.6	1,706.6	1,436.3
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	5.4	4.2
Long-lived assets held for sale or disposal, impairment charge	10.0	12.5	14.8
Goodwill, impairment charge	18.0	18.1
impairment of intangible assets	11.9	15.0	3.3
Total, impairment charge	40.2	51.0	22.3
Long-lived assets held and used, net book value		1.3	4.0
Long-lived assets held for sale or disposal, net book value	14.4	3.2	18.5
Goodwill	0.0	0.0
Other intangible assets, net book value	0.0	0.0	0.0
Total Assets	14.4	4.5	22.5
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		1.3	4.2
Long-lived assets held for sale or disposal, fair value measurement	17.9	20.8	20.2
Goodwill, fair value measurement	0.0	0.0
Other intangible assets, fair value measurement	0.0	0.0	0.0
Total, fair value measurement	$ 17.9	$ 22.1	$ 24.4