Earnings Per Common Share (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended
	May 20, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Subordinated Convertible Notes Due 2029 [Member]	Dec. 31, 2013 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 10, 2013 Stock Repurchase Program [Member]	Dec. 31, 2013 Stock Repurchase Program [Member]
Debt Instrument [Line Items]
Payments of dividends in total		$ 26.7
Dividends per common share	$ 0.18	$ 0.54
Stock repurchase program, authorized amount									125
Repurchase of common shares, value		19.5	1.2	62.5						19.5
Repurchase of common shares, shares						597,000	50,000	2,529,000		597,531
Average price per share										$ 32.65
Stock options and restricted stock units excluded from the earnings per common share		288,000	553,000	506,000
Total debt		$ 1,386.9	$ 1,450.1
Weighted average conversion price per share					$ 36.75
Average stock considered as issuable under the treasury		0	0	600,000