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Long-Term Debt Senior Notes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 29, 2012 Senior notes due 2019 [Member]	May 31, 2011 Senior notes due 2019 [Member]	Apr. 30, 2011 Senior notes due 2019 [Member]	Dec. 31, 2012 Senior notes due 2019 [Member]	Feb. 17, 2012 Senior notes due 2019 [Member]	Dec. 31, 2011 Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, stated interest rate							8.50%
Proceeds from issuance of long-term debt	$ 135.7	$ 1,175.0	$ 500.0	$ 130.0	$ 450.0	$ 725.0
Debt, long-term and short-term	3,766.0						1,305.0		1,175.0
Premium, percentage of par value								104.375%
Premium, Unamortized							$ 5.0	$ 5.7	$ 0

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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