Pension and Other Post Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
U.S. qualified pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	$ 12.0
2014	15.7
2015	20.0
2016	24.9
2017	30.0
2018-2022	229.0
U.K. pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	0.3
2014	0.4
2015	0.4
2016	0.4
2017	0.4
2018-2022	2.1
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	1.4
2014	3.0
2015	5.4
2016	6.2
2017	6.9
2018-2022	$ 42.7