Employee Retirement Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Obligations and Funded Status
Accumulated Benefit Obligations	$ 392.1	$ 442.5
Projected Benefit Obligations:
Beginning of year	442.5	364.8
Service cost	1.1	0.9	0.8
Interest	18.5	19.4	19.6
Benefits paid	(15.8)	(13.3)
Actuarial (gain)/loss	(54.2)	70.7
End of year	392.1	442.5	364.8
Plans' Assets:
Beginning of year	340.1	290.6
Actual return on assets	56.0	45.5
Employer contributions	18.9	17.3
Benefits paid	(15.8)	(13.3)
End of year	399.2	340.1	290.6
Consolidated Balance Sheet Components:
Net funded status	7.1	(102.4)
Percent of projected benefit obligations funded	101.80%	76.90%
Other assets
Consolidated Balance Sheet Components:
Net funded status	17.8	0
Accrued liabilities
Consolidated Balance Sheet Components:
Net funded status	$ (10.7)	$ (102.4)