Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended								0 Months Ended					3 Months Ended		6 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Jun. 30, 2014	Apr. 25, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 15, 2012	Mar. 30, 2009	Apr. 25, 2014 Senior Notes Five Year	Apr. 25, 2014 Senior Notes Seven Year	Apr. 25, 2014 Senior Notes Ten Year	Apr. 25, 2014 Senior Notes Twelve Year	Apr. 25, 2014 Senior Notes Fifteen Year	Sep. 30, 2013 Derivatives Designated as Hedging Instruments	Mar. 31, 2013 Derivatives Designated as Hedging Instruments	Sep. 30, 2013 Derivatives Designated as Hedging Instruments	Sep. 30, 2014 Derivatives Designated as Hedging Instruments	Dec. 31, 2013 Derivatives Designated as Hedging Instruments	Sep. 30, 2014 Not Designated as Hedging Instrument	Sep. 30, 2013 Not Designated as Hedging Instrument	Sep. 30, 2014 Not Designated as Hedging Instrument	Sep. 30, 2013 Not Designated as Hedging Instrument	Sep. 30, 2014 Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives designated as hedging instruments outstanding																		$ 0	$ 0
Proceeds from interest rate swap																60
Interest expense															0		1.3
Debt instrument maturity year		2014															2019
Fair value decrease																	(1.3)
Gain in other Financial Items, net																				0.8	0.3	1.9	0.3
Long term debt issued				1,250.00						208.00	275.00	297.00	285.00	185.00
Long term debt issued, stated interest rate								3.854%	8.00%	2.84%	3.51%	4.09%	4.24%	4.44%
Long term debt issued, average interest rate				3.84%
Long term debt maturity period										5 years	7 years	10 years	12 years	15 years
Restructuring reserves	87.7	87.7	96.1		93.7	94.2	75.8																	87.7
Asset impairment charges	$ 0	$ 0