Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contribution to pension plans during current fiscal year	$ 13.3
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.0	2.2
Interest cost	3.3	3.1
Expected return on assets	(3.3)	(2.8)
Other	1.0	0.9
Net periodic benefit cost	3.0	3.4
Contributions to pension plans	3.3
Retiree Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	0.2	0.3
Expected return on assets	0	0
Other	0	0.1
Net periodic benefit cost	0.2	0.4
Contributions to retiree health care plan	$ 0.5