Supplementary Cash Flow Disclosures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Cash paid for income taxes not payable until 2013		$ 17
Cash paid for income taxes		40us-gaap_IncomeTaxesPaid
Income tax refund	21.5
Non-cash interest expense	5.7us-gaap_OtherNoncashExpense	7.1us-gaap_OtherNoncashExpense	8.7us-gaap_OtherNoncashExpense
Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016 [Member]
Debt Instrument [Line Items]
Interest rate	11.50%	11.50%	11.50%
Subordinated Notes [Member]
Debt Instrument [Line Items]
Subordinated notes	$ 50

Income Taxes Paid, Amount Not Payable Until Next Fiscal Year

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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