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Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income (controlling interest)	$ 62.4	$ 37.4
Denominator:
Average shares outstanding - basic	52.7	51.6
Effect of dilutive instruments:
Stock options and other awards (in shares)	1.3	1.3
Forward equity sales (in shares)	0.2
Average shares outstanding - diluted	54.2	52.9
Stock options and other awards
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	0.0	1.2
Senior convertible securities
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	3.6	3.6
Junior convertible trust preferred securities
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	4.2	4.2

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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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