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Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Numerator:
Net income (controlling interest)	$ 37.4	$ 39.1
Denominator:
Average shares outstanding - basic (in shares)	51.6	51.8
Effect of dilutive instruments:
Stock options and other awards (in shares)	1.3	1.3
Average shares outstanding - diluted (in shares)	52.9	53.1
Stock transactions:
Shares repurchased under share repurchase programs	0.3
Stock options and other awards
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	1.2	0.6
Senior convertible notes
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	4.2	4.2
Junior convertible trust preferred securities
Anti-dilutive securities
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	3.7	3.7

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