Condensed Consolidating Guarantor Financial Statements (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 29.4	$ (7.8)	$ 66.5	$ 0.6
Non-cash expenses			24.4	24.2
Changes in working capital			(89.4)	(200.0)
Net adjustments			(65.0)	(175.8)
Net cash provided by (used in) operating activities			1.5	(175.2)
Investing activities:
Net cash provided by (used in) investing activities			(17.8)	(15.4)
Financing activities:
Net cash provided by (used in) financing activities			(11.3)	173.9
Net increase (decrease) in cash and cash equivalents			(27.6)	(16.7)
Effect of exchange rate changes on cash and cash equivalents			(0.2)	0.9
Net change in cash and cash equivalents			(27.8)	(15.8)
Cash and cash equivalents-beginning of period			61.3	62.2
Cash and cash equivalents-end of period	33.5	46.4	33.5	46.4
Parent [Member]
Operating activities:
Net income	30.6	(7.2)	68.8	2.2
Non-cash expenses			18.0	(3.4)
Equity in earnings of subsidiaries	(63.7)	(23.7)	(133.0)	(63.3)
Changes in working capital			9.0	380.8
Net adjustments			(106.0)	314.1
Net cash provided by (used in) operating activities			(37.2)	316.3
Investing activities:
Net cash provided by (used in) investing activities			(2.2)	8.1
Financing activities:
Net cash provided by (used in) financing activities			38.9	(316.2)
Net increase (decrease) in cash and cash equivalents			(0.5)	8.2
Net change in cash and cash equivalents			(0.5)	8.2
Cash and cash equivalents-beginning of period			3.0	0.5
Cash and cash equivalents-end of period	2.5	8.7	2.5	8.7
Guarantor [Member]
Operating activities:
Net income	63.9	23.8	133.2	63.3
Non-cash expenses			2.8	25.6
Equity in earnings of subsidiaries	(2.6)	(4.6)	(3.8)	(6.4)
Changes in working capital			(76.1)	(543.7)
Net adjustments			(77.1)	(524.5)
Net cash provided by (used in) operating activities			56.1	(461.2)
Investing activities:
Net cash provided by (used in) investing activities			(57.0)	439.9
Financing activities:
Net cash provided by (used in) financing activities			(2.8)	17.6
Net increase (decrease) in cash and cash equivalents			(3.7)	(3.7)
Effect of exchange rate changes on cash and cash equivalents				(0.3)
Net change in cash and cash equivalents			(3.7)	(4.0)
Cash and cash equivalents-beginning of period			16.0	15.7
Cash and cash equivalents-end of period	12.3	11.7	12.3	11.7
Non-guarantor [Member]
Operating activities:
Net income	1.2	3.9	1.3	4.8
Non-cash expenses			3.6	2.0
Changes in working capital			(22.3)	(37.1)
Net adjustments			(18.7)	(35.1)
Net cash provided by (used in) operating activities			(17.4)	(30.3)
Investing activities:
Net cash provided by (used in) investing activities			2.5	(3.2)
Financing activities:
Net cash provided by (used in) financing activities			(8.5)	12.3
Net increase (decrease) in cash and cash equivalents			(23.4)	(21.2)
Effect of exchange rate changes on cash and cash equivalents			(0.2)	1.2
Net change in cash and cash equivalents			(23.6)	(20.0)
Cash and cash equivalents-beginning of period			42.3	46.0
Cash and cash equivalents-end of period	18.7	26.0	18.7	26.0
Eliminations [Member]
Operating activities:
Net income	(66.3)	(28.3)	(136.8)	(69.7)
Equity in earnings of subsidiaries	66.3	28.3	136.8	69.7
Net adjustments			136.8	69.7
Investing activities:
Net cash provided by (used in) investing activities			38.9	(460.2)
Financing activities:
Net cash provided by (used in) financing activities			$ (38.9)	$ 460.2