Comprehensive Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Currency Translation Adjustment [Roll Forward]
Balance at beginning of year	$ 29,900,000	$ 46,600,000	$ 55,700,000
Current year net change	2,100,000	16,700,000	(9,200,000)
Balance at end of year	32,000,000	29,900,000	46,600,000
Accumulated Other Comprehensive Income (Loss), Unrecognized Pension Costs [Roll Forward]
Balance at beginning of year	(77,500,000)	(51,900,000)	(52,200,000)
Current year net change	(7,800,000)	(25,600,000)	300,000
Balance at end of year	(85,300,000)	(77,500,000)	(51,900,000)
Accumulated Other Comprehensive Income (Loss), Net Gain (Loss) On Cash Flow Hedges [Roll Forward]
Balance at beginning of year	2,300,000	1,700,000	(300,000)
Current year net change	(200,000)	600,000	2,100,000
Balance at end of year	2,100,000	2,300,000	1,700,000
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(45,331,000)	(3,600,000)	3,200,000
Current year net change	(5,900,000)	(41,700,000)	(6,800,000)
Balance at end of year	$ (51,198,000)	$ (45,331,000)	$ (3,600,000)