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Significant Accounting Policies (Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 16, 2014	Mar. 08, 2012	May 02, 2011
Significant Accounting Policies [Line Items]
Common stock equivalents (in shares)	1,285,000	1,120,000
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	26,000	961,000
Stock repurchase program authorized amount				$ 257.8	$ 323.7	$ 300.0
Stock repurchase program remaining authorized repurchase amount	$ 306.2		$ 400.0	$ 400.0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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