Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended			12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2011 California Franchise Tax Board [Member]	Dec. 31, 2010 California Franchise Tax Board [Member]	Dec. 31, 2009 California Franchise Tax Board [Member]	Dec. 31, 2011 Internal Revenue Service (IRS) [Member]	Dec. 31, 2010 Internal Revenue Service (IRS) [Member]	Dec. 31, 2009 Internal Revenue Service (IRS) [Member]	Dec. 31, 2011 Canada Revenue Agency [Member]	Dec. 31, 2010 Canada Revenue Agency [Member]	Dec. 31, 2009 Illinois Department of Revenue [Member]	Dec. 31, 2008 Illinois Department of Revenue [Member]	Dec. 31, 2011 New York City Department of Finance [Member]	Dec. 31, 2010 New York City Department of Finance [Member]	Dec. 31, 2009 New York City Department of Finance [Member]
Income Taxes [Line Items]
U.S. federal statutory rate		35.00%
Effective income tax rate	10.90%
Income before income taxes, domestic operations		$ 38.8	$ 33.2
Income before income taxes, foreign operations		37.5	42.9
Liabilities for uncertain income tax positions	42.7	42.7		43.9
Cash paid for income taxes		14.9
Prepaid tax payments	$ 19.5	$ 19.5		$ 11.3
Income Tax Examination, Year under Examination					2011	2010	2009	2011	2010	2009	2011	2010	2009	2008	2011	2010	2009