Pension and Other Post-Retirement Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$ 377,500,000
Company contributions	1,600,000	1,400,000	0
Plan assets at end of year	409,100,000	377,500,000
Amount Recognized
Other liabilities	(112,800,000)	(92,300,000)
Accumulative other comprehensive loss:
After-tax amount recognized in accumulated other comprehensive loss	131,100,000	118,700,000	99,900,000	105,000,000
Defined Benefit Pension [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	425,000,000	413,200,000
Service cost	5,700,000	5,400,000	5,300,000
Interest cost	19,700,000	20,700,000	22,100,000
Actuarial loss	49,200,000	13,500,000
Benefits paid	(27,400,000)	(27,500,000)
Effect of foreign exchange rate changes	1,600,000	(300,000)
Benefit obligation at end of year	473,800,000	425,000,000	413,200,000
Change in Fair Value of Plan Assets
Plan assets at beginning of year	377,500,000	392,700,000
Actual return on plan assets	55,300,000	10,200,000
Effect of exchange rate changes	1,600,000	(100,000)
Company contributions	2,100,000	2,200,000
Benefits paid	(27,400,000)	(27,500,000)
Plan assets at end of year	409,100,000	377,500,000	392,700,000
Funded Status at end of year	(64,700,000)	(47,500,000)
Amount Recognized
Other liabilities	(64,700,000)	(47,500,000)
Accumulative other comprehensive loss:
Net actuarial loss	207,400,000	193,500,000
Prior service credit (cost)	(4,100,000)	(5,100,000)
Accumulated other comprehensive loss	203,300,000	188,400,000
Total recognized	138,600,000	140,900,000
After-tax amount recognized in accumulated other comprehensive loss	126,800,000	117,600,000
Retiree Health and Life [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	44,800,000	46,600,000
Service cost	200,000	200,000	200,000
Interest cost	2,000,000	2,200,000	2,400,000
Actuarial loss	4,900,000	0
Benefits paid	(3,800,000)	(4,200,000)
Effect of foreign exchange rate changes	0	0
Benefit obligation at end of year	48,100,000	44,800,000	46,600,000
Change in Fair Value of Plan Assets
Plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Effect of exchange rate changes	0	0
Company contributions	3,800,000	4,200,000
Benefits paid	(3,800,000)	(4,200,000)
Plan assets at end of year	0	0	0
Funded Status at end of year	(48,100,000)	(44,800,000)
Amount Recognized
Other liabilities	(48,100,000)	(44,800,000)
Accumulative other comprehensive loss:
Net actuarial loss	6,800,000	1,800,000
Prior service credit (cost)	200,000	0
Accumulated other comprehensive loss	7,000,000	1,800,000
Total recognized	(41,100,000)	(43,000,000)
After-tax amount recognized in accumulated other comprehensive loss	$ 4,300,000	$ 1,100,000