v2.3.0.15

Notes Payable (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Debt Instrument [Line Items]
Notes Payable	$ 675.4		$ 675.4		$ 609.8
Line of Credit Facility, Maximum Borrowing Capacity	180.0		180.0		245.0
Interest Expense before Capitalization of Interest	10.0	8.6	29.8	25.7
Capitalization of Interest	(0.7)	(0.5)	(1.8)	(1.3)
Interest Expense	9.3	8.1	28.0	24.4
Interest Paid	0.4	0.3	19.4	16.5
Notes Payable under Revolving Credit Agreement
Debt Instrument [Line Items]
Notes Payable	65.0		65.0		0
Interest Expense before Capitalization of Interest	0.6	0.4	1.5	1.3
Interest Paid	0.3	0.2	0.5	0.5
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member]
Debt Instrument [Line Items]
Notes Payable	356.7		356.7		356.3
Notes Payable, Interest Rate, Stated Percentage	6.00%		6.00%
Interest Expense before Capitalization of Interest	5.5	5.5	16.5	16.5
Interest Paid	0	0	10.8	10.8
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member]
Debt Instrument [Line Items]
Notes Payable	248.1		248.1		247.8
Notes Payable, Interest Rate, Stated Percentage	6.00%		6.00%
Interest Expense before Capitalization of Interest	3.8	0	11.5	0
Interest Paid	0	0	7.8	0
Senior Subordinated Notes [Member] | Senior Notes, 4 Point 875 Due November 1, 2010 [Member]
Debt Instrument [Line Items]
Notes Payable, Interest Rate, Stated Percentage	4.875%		4.875%
Interest Expense before Capitalization of Interest	0	2.6	0	7.6
Interest Paid	0	0	0	4.9
Mortgage Note Payabe at Amortized Cost [Member]
Debt Instrument [Line Items]
Notes Payable	5.6		5.6		5.7
Interest Expense before Capitalization of Interest	0.1	0.1	0.3	0.3
Interest Paid	$ 0.1	$ 0.1	$ 0.3	$ 0.3

X

- Definition

Interest rate stated in the contractual debt agreement.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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