Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	$ (22,355,000)	$ (68,000,000)	$ (27,745,000)	$ (55,300,000)
Other comprehensive income loss before reclassifications	1,200,000	(9,000,000)
Amounts reclassified from accumulated other comprehensive income loss	4,200,000	(3,700,000)
Net current period other comprehensive income loss	5,389,000	(12,670,000)
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	7,300,000	3,100,000	5,600,000	4,200,000
Other comprehensive income loss before reclassifications	1,800,000	1,600,000
Amounts reclassified from accumulated other comprehensive income loss	(100,000)	(2,700,000)
Net current period other comprehensive income loss	1,700,000	(1,100,000)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	(17,900,000)	900,000	(23,700,000)	(10,700,000)
Other comprehensive income loss before reclassifications	1,500,000	12,600,000
Amounts reclassified from accumulated other comprehensive income loss	4,300,000	(1,000,000)
Net current period other comprehensive income loss	5,800,000	11,600,000
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	(18,800,000)	(20,500,000)	(19,600,000)	(21,700,000)
Other comprehensive income loss before reclassifications	800,000	1,200,000
Amounts reclassified from accumulated other comprehensive income loss	0	0
Net current period other comprehensive income loss	800,000	1,200,000
Accumulated Translation Adjustment
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	7,100,000	(51,500,000)	10,000,000	(27,100,000)
Other comprehensive income loss before reclassifications	(2,900,000)	(24,400,000)
Amounts reclassified from accumulated other comprehensive income loss	0	0
Net current period other comprehensive income loss	$ (2,900,000)	$ (24,400,000)