Pension and Other Post-Retirement Benefit Plans (Pension Plan Assets Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 95.7	$ 86.1	$ 74.4
U.S.
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	462.5	406.0	380.5
U.S. | Cash
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	35.7	36.1
U.S. | Large cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	127.0	109.6
U.S. | Mid cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	9.4	8.8
U.S. | Small cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	73.7	62.8
U.S. | International companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	116.4	99.0
U.S. | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	55.6	49.0
U.S. | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	40.1	37.1
U.S. | Emerging market bonds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4.6	3.6
U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	366.8	319.9
U.S. | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	35.7	36.1
U.S. | Level 1 | Large cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	127.0	109.6
U.S. | Level 1 | Mid cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	9.4	8.8
U.S. | Level 1 | Small cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	73.7	62.8
U.S. | Level 1 | International companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	116.4	99.0
U.S. | Level 1 | Emerging market bonds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4.6	3.6
U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	95.7	86.1
U.S. | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	55.6	49.0
U.S. | Level 3 | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	40.1	37.1
International
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	327.9	362.1	321.9
International | Cash
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	1.0	0.9
International | Large cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	47.2	43.6
International | Mid cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0.1
International | International companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	182.3	148.0
International | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	97.3	169.6
International | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	230.6	192.5
International | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	1.0	0.9
International | Level 1 | Large cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	47.2	43.6
International | Level 1 | Mid cap
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0.1
International | Level 1 | International companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	182.3	148.0
International | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	97.3	169.6
International | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 97.3	$ 169.6