Retirement Benefit Plans (Fair Value Hierarchy) (Details) (Defined Benefit Pension Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 60.0	$ 51.6
Level 1 | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	31.4	27.2
Level 1 | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	7.4	6.1
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	20.6	17.9
Level 1 | Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	0.6	0.4
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	5.0	4.6
Level 2 | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	0	0
Level 2 | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	3.5	3.1
Level 2 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	1.5	1.5
Level 2 | Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 0	$ 0