Allowance for Doubtful Account (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at December 31, 2015	$ 9.9
2016 Charges	1.6	$ 2.9
2016 Charge- offs, Net of Recoveries	0.9
Balance at June 30, 2016	10.6
Total trade receivables
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at December 31, 2015	9.5
2016 Charges	1.6
2016 Charge- offs, Net of Recoveries	0.9
Balance at June 30, 2016	10.2
Trade accounts receivable
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at December 31, 2015	9.2
2016 Charges	1.6
2016 Charge- offs, Net of Recoveries	(0.9)
Balance at June 30, 2016	9.9
Notes Receivable [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at December 31, 2015	0.3
2016 Charges	0.0
2016 Charge- offs, Net of Recoveries	0.0
Balance at June 30, 2016	0.3
Other notes receivable
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at December 31, 2015	0.4
2016 Charges	0.0
2016 Charge- offs, Net of Recoveries	0.0
Balance at June 30, 2016	$ 0.4