Indebtedness (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2012 6.875% senior unsecured notes	Aug. 31, 2010 6.875% senior unsecured notes	Dec. 31, 2012 Trade receivables financing arrangement	Dec. 31, 2012 7.625% senior notes	Dec. 31, 2007 7.625% senior notes	Dec. 31, 2012 Other indebtedness	Dec. 31, 2011 Other indebtedness
Debt activity
Aggregate principal amount		$ 600.0			$ 500.0
Interest rate percentage	6.875%	6.875%		7.625%	7.625%
Repayments under senior credit facilities	562.5
Termination costs paid for swaps related to term loan that was repaid	26.9
Accrued interest paid related to term loan which was repaid	2.6
Percentage of the principal amount at which notes are redeemable at any time prior to maturity	100.00%			100.00%
Percentage of the aggregate principal amount at which notes may redeemed with proceeds from certain equity offerings at any time prior to September 1, 2013	35.00%
Percentage of the principal amount representing redemption price of notes which may be redeemed with proceeds from certain equity offerings	106.875%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control	101.00%			101.00%
Trade receivables from financing agreement, maximum borrowing capacity			130.0
Other Borrowings and Financing Activities
Outstanding amount, purchase card program agreement						27.9	40.4
Amount of available borrowing capacity			$ 46.3