Debt (Details 1) (USD $) In Millions	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2011	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2011 $99.5 million 9.250% debentures due May 2021 [Member]	Jun. 30, 2011 $99.5 million 9.250% debentures due May 2021 [Member]	Jun. 30, 2011 Credit facilities [Member]	Jun. 30, 2011 $600.0 million 7.125% senior notes due May 2016 [Member]	Jun. 30, 2011 Debentures, fixed interest rate of 7.400%, due September 2035 [Member]	Mar. 31, 2010 Accounts receivable securitization program [Member]	Jun. 30, 2011 Interest Rate Locks [Member]	Mar. 31, 2010 $425.0 million 6.125% senior notes due February 2014 [Member]	Mar. 31, 2010 $600.0 million 7.250% senior notes due March 2015 [Member]
Summary of Loss on Extinguishment of Debt
Principal Repaid					$ 5.0	$ 59.2	$ 0	$ 600.0	$ 182.7	$ 300.0	$ 0	$ 425.0	$ 600.0
Cash Paid in Loss on Extinguishment of Debt		30.5	87.8		1.5	22.7	0	21.4	41.9	0	0.3	8.7	21.8
Non-cash Loss on Extinguishment of Debt		101.8	113.5		0.3	3.5	1.7	61.3	46.7	0.2	0	44.1	57.5
Total Loss on Extinguishment of Debt	$ (199.5)	$ 132.3	$ (201.3)	$ (132.3)	$ 1.8	$ 26.2	$ 1.7	$ 82.7	$ 88.6	$ 0.2	$ 0.3	$ 52.8	$ 79.3