Retirement Plans - Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
International
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation, end of year	$ 25.7	$ 37.3
Accumulated benefit obligation, end of year	25.7	36.9
Plan assets at fair value, end of year	19.7	25.8
United States
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation, end of year	78.5	88.3
Accumulated benefit obligation, end of year	78.5	88.3
Plan assets at fair value, end of year	$ 71.0	$ 71.7