Significant Accounting Policies (Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 08, 2012 2011 Stock Repurchase Program [Member]	May 02, 2011 2011 Stock Repurchase Program [Member]	Dec. 31, 2013 2011 Stock Repurchase Program [Member]	Dec. 31, 2012 2011 Stock Repurchase Program [Member]
Significant Accounting Policies [Line Items]
Common stock equivalents (in shares)	949,000	954,000	1,446,000
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	941,000	1,539,000	2,496,000
Stock repurchase program authorized amount				$ 323.7	$ 300.0
Stock repurchase program remaining authorized repurchase amount						$ 280.0	$ 350.0