Income Tax (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Income Tax [Abstract]
Foreign withholding tax expense	$ 0.4
Accrued income taxes	21.7
Accrued income taxes, current	13.7
Non-current tax liabilities	8.0
Accrued income taxes, current judgment	3.5
Increase to gross unrecognized tax benefits	0.1
Net tax balance	2.4
Impact of effective tax rate if recognized	1.3
Uncertain tax position probable changes in next 12 months, minimum	0.9
Uncertain tax position probable changes in next 12 months, maximum	$ 1.8