Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contribution to pension plans during current fiscal year	$ 13.3		$ 13.3
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.1	2.2	4.1	4.4
Interest cost	3.4	3.0	6.7	6.1
Expected return on assets	(3.5)	(2.8)	(6.8)	(5.6)
Curtailment gain	0	(2.3)	0	(2.3)
Other	1.0	1.0	2.0	1.9
Total benefit cost	3.0	1.1	6.0	4.5
Contributions to pension plans	2.9		6.2
Retiree Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.2	0.3	0.4	0.6
Net loss	0	0.1	0	0.2
Total benefit cost	0.2	0.4	0.4	0.8
Contributions to retiree health care plan	$ 0.4		$ 0.9