Stockholders' Equity Stockholder's Equity (Reclassification out of Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 1,646.0		$ 1,396.6
Selling, general and administrative expense	170.8		136.2
Reclassification adjustment for net gains included in net income	(3.2)		(1.1)
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(5.1)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial losses	(8.0)	[1]
Amortization of prior service credit	0.2	[1]
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	(7.8)
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	2.7
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(5.1)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Revenue	2.3
Costs of sales	1.5
Selling, general and administrative expense	0.1
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	3.9
Reclassification Adjustment from AOCI on Derivatives, Tax	(0.7)
Reclassification adjustment for net gains included in net income	$ 3.2

[1] (a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 8 for additional details).