Comprehensive Income (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Reclassifications out of accumulated other comprehensive income, net of related tax [Abstract]
Amortization of prior service cost	$ (500,000)
Amortization of actuarial gains(losses)	4,200,000
Total reclassifications from accumulated other comprehensive income	3,700,000
Accumulated Other Comprehensive Income (Loss), Currency Translation Adjustment [Roll Forward]
Balance at beginning of year	32,000,000
Other comprehensive income/loss before reclassifications	(21,200,000)
Amounts reclassified from AOCI	0
Net current period other comprehensive income/loss	(21,200,000)
Balance at end of year	10,800,000
Accumulated Other Comprehensive Income (Loss), Unrecognized Pension Costs [Roll Forward]
Balance at beginning of year	(85,300,000)
Other comprehensive income/loss before reclassifications	0
Amounts reclassified from AOCI	3,700,000
Net current period other comprehensive income/loss	3,700,000
Balance at end of year	(81,600,000)
Accumulated Other Comprehensive Income (Loss), Net Gain (Loss) On Cash Flow Hedges [Roll Forward]
Balance at beginning of year	2,100,000
Other comprehensive income/loss before reclassifications	500,000
Amounts reclassified from AOCI	0
Net current period other comprehensive income/loss	500,000
Balance at end of year	2,600,000
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(51,198,000)
Other comprehensive income/loss before reclassifications	(20,700,000)
Amounts reclassified from AOCI	3,700,000
Comprehensive income (loss) attributable to MTI	(17,000,000)
Balance at end of year	$ (68,247,000)