Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 1,419.9	$ 1,393.6
Current portion of long-term debt	3.4	3.3
Long-term debt	1,416.5	1,390.3
Long-term debt, net	1,403.3	1,375.7
Total Debt Instruments excluding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	13.2	14.6
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0.0	0.0
Unsecured Debt [Member] \| 7.75% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200.0	200.0
Unsecured Debt [Member] \| 6.625% Notes [Member]
Debt Instrument [Line Items]
Notes payable	550.0	550.0
Unsecured Debt [Member] \| 6.25% Notes [Member]
Debt Instrument [Line Items]
Notes payable	400.0	400.0
Unsecured Debt [Member] \| 5.125% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200.0	200.0
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	64.6	38.0
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 5.3	$ 5.6

Long-Term Debt, net of Issuance Costs based on application of ASU 2015-03.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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