Retirement Benefit Plans (Obligation and Funded Status) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amounts recognized in the balance sheets consist of:
Noncurrent liabilities	$ (24.4)	$ (29.3)
Defined Benefit Pension Plans
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Prior service credit included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, before tax	0.1
Prior service credit included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, net of tax	0.1
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, before tax	2.5
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, net of tax	1.6
U.S. Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	69.8	65.8
Interest cost	3.1	3.4	3.6
Actuarial loss	5.3	4.8
Benefits paid	(5.2)	(4.2)
Foreign currency exchange rate changes	0	0
Benefit obligation at end of year	73.0	69.8	65.8
Accumulated benefit obligation at end of year	73.0	69.8
Change in plan assets
Fair value of plan assets at beginning of year	51.6	53.2
Actual return on plan assets	6.5	2.2
Employer contributions	7.1	0.4
Benefits paid	(5.2)	(4.2)
Foreign currency exchange rate changes	0	0
Fair value of plan assets at end of year	60.0	51.6	53.2
Funded status at end of year	(13.0)	(18.2)
Amounts recognized in the balance sheets consist of:
Current liabilities	(0.5)	(0.7)
Noncurrent liabilities	(12.5)	(17.5)
Amount recognized in the the balance sheets	(13.0)	(18.2)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	32.2	31.8
Prior service credit	0.2	0.1
Deferred taxes	(13.3)	(12.2)
Accumulated other comprehensive income (loss)	19.1	19.7
Non-U.S. Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	4.9	4.4
Interest cost	0.2	0.2	0.2
Actuarial loss	0.2	0.7
Benefits paid	(0.1)	(0.3)
Foreign currency exchange rate changes	0	(0.1)
Benefit obligation at end of year	5.2	4.9	4.4
Accumulated benefit obligation at end of year	5.2	4.9
Change in plan assets
Fair value of plan assets at beginning of year	4.6	5.2
Actual return on plan assets	0.4	(0.2)
Employer contributions	0	0
Benefits paid	(0.1)	(0.3)
Foreign currency exchange rate changes	0.1	(0.1)
Fair value of plan assets at end of year	5.0	4.6	5.2
Funded status at end of year	(0.2)	(0.3)
Amounts recognized in the balance sheets consist of:
Current liabilities	0	0
Noncurrent liabilities	(0.2)	(0.3)
Amount recognized in the the balance sheets	(0.2)	(0.3)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	2.3	2.5
Prior service credit	0	0
Deferred taxes	(0.9)	(1.0)
Accumulated other comprehensive income (loss)	1.4	1.5
Other Postretirement Benefit Plans, Defined Benefit
Change in benefit obligation
Benefit obligation at beginning of year	3.1	3.2
Service cost	0.1	0.1	0.1
Interest cost	0.1	0.2	0.2
Actuarial loss	0.3	0
Plan amendments	0	0	0.9
Benefits paid	(0.3)	(0.4)
Benefit obligation at end of year	3.3	3.1	3.2
Change in plan assets
Benefits paid	(0.3)	(0.4)
Funded status at end of year	(3.3)	(3.1)
Amounts recognized in the balance sheets consist of:
Current liabilities	(0.2)	(0.2)
Noncurrent liabilities	(3.1)	(2.9)
Amount recognized in the the balance sheets	(3.3)	(3.1)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	0.5	0.2
Prior service credit	(0.5)	(0.7)
Deferred taxes	0.7	0.2
Accumulated other comprehensive income (loss)	0.7	(0.3)
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Transition obligation included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, net of tax	0
Prior service credit included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, before tax	0.1
Prior service credit included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, net of tax	0.1
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2013, net of tax	$ 0