Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Notes and other indebtedness
Amount outstanding	$ 833.4	$ 1,011.6
Less current portion of debt	188.9	519.4
Long-term debt	644.5	492.2
Accounts receivable securitization program
Notes and other indebtedness
Amount outstanding	135.0	135.0
Secured promissory notes
Notes and other indebtedness
Amount outstanding	7.8	14.5
Equipment credit facilities
Notes and other indebtedness
Amount outstanding	0	12.0
Real estate credit agreement
Notes and other indebtedness
Amount outstanding	0	101.7
Term loan credit facility
Notes and other indebtedness
Amount outstanding	125.0	125.0
Series C convertible senior debentures
Notes and other indebtedness
Amount outstanding	0	90.1
Revolving credit facilities
Notes and other indebtedness
Amount outstanding	175.5	31.1
Senior notes
Notes and other indebtedness
Amount outstanding	370.0	370.0
Related party credit agreements
Notes and other indebtedness
Amount outstanding	6.4	114.9
Other indebtedness
Notes and other indebtedness
Amount outstanding	$ 13.7	$ 17.3