Pension and Other Post-Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in Fair Value of Plan Assets
Company contributions	$ 1.8	$ 1.6	$ 1.6
Plan assets at end of year	457.0
Amount Recognized
Other liabilities	(86.6)	(68.2)
Accumulative other comprehensive loss:
After-tax amount recognized in accumulated other comprehensive loss	107.7	78.2	131.1	118.7
Defined Benefit Pension [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	442.7	473.8
Service cost	5.9	6.7	5.7
Interest cost	20.7	18.4	19.7
Actuarial loss	67.0	(26.8)
Benefits paid	31.2	30.3
Effect of foreign exchange rate changes	(2.4)	0.9
Benefit obligation at end of year	502.7	442.7	473.8
Change in Fair Value of Plan Assets
Plan assets at beginning of year	447.8	409.1
Actual return on plan assets	40.3	65.9
Effect of exchange rate changes	(2.4)	0.7
Company contributions	2.4	2.4
Benefits paid	31.2	30.3
Plan assets at end of year	456.9	447.8	409.1
Funded Status at end of year	(45.8)	5.1
Amount Recognized
Other liabilities	(45.8)	5.1
Accumulative other comprehensive loss:
Net actuarial loss	170.9	127.6
Prior service credit (cost)	(2.1)	(3.1)
Accumulated other comprehensive loss	168.8	124.5
After-tax amount recognized in accumulated other comprehensive loss	105.4	77.6
Retiree Health and Life [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	40.4	48.1
Service cost	0.1	0.2	0.2
Interest cost	1.6	1.6	2.0
Actuarial loss	2.6	(6.2)
Benefits paid	3.9	3.3
Effect of foreign exchange rate changes	0	0
Benefit obligation at end of year	40.8	40.4	48.1
Change in Fair Value of Plan Assets
Plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Effect of exchange rate changes	0	0
Company contributions	3.9	3.3
Benefits paid	3.9	3.3
Plan assets at end of year	0	0	0
Funded Status at end of year	(40.8)	(40.4)
Amount Recognized
Other liabilities	(40.8)	(40.4)
Accumulative other comprehensive loss:
Net actuarial loss	3.3	0.6
Prior service credit (cost)	0.4	0.4
Accumulated other comprehensive loss	3.7	1.0
After-tax amount recognized in accumulated other comprehensive loss	$ 2.3	$ 0.6