Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes [Line Items]
U.S. federal statutory rate	35.00%
Effective income tax rate	22.60%
Income before income taxes, domestic operations	$ 13.8	$ 7.1
Income before income taxes, foreign operations	23.1	15.7
Liabilities for uncertain income tax positions	31.6		30.1
Cash paid for income taxes	2.8
Prepaid tax payments	$ 4.5		$ 11.0
California Franchise Tax Board [Member]
Income Taxes [Line Items]
Income Tax Examination, Year(s) under Examination	tax years 2005 through 2007
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income Tax Examination, Year(s) under Examination	tax year 2009
Canada Revenue Agency [Member]
Income Taxes [Line Items]
Income Tax Examination, Year(s) under Examination	tax years 2008 through 2010