Income Taxes (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate	30.20%	40.10%	32.60%	40.10%
Net payable related to Separation-related tax liabilities	$ 34.8		$ 34.8		$ 56.5
Uncertain tax positions	24.1		24.1		47.8
Offsetting tax benefits related to uncertain tax positions			3.4		32.6
Uncertain tax positions, net	20.7		20.7		15.2
Accrued interest and penalties on uncertain tax positions	8.7		8.7		4.7
Net of tax benefits			$ 3.6		$ 1.9