Retirement Plans and Other Investment Categories (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	$ 136.8	$ 125.8	$ 123.6
U.S. Pension Benefits | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.0	9.4
U.S. Pension Benefits | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	130.8	116.4
U.S. Pension Benefits | Cash, including money market funds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.0	9.4
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.0	9.4
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	31.0	25.0
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	31.0	25.0
U.S. Pension Benefits | Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	10.0	10.2
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	10.0	10.2
U.S. Pension Benefits | U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	63.8	56.9
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	63.8	56.9
U.S. Pension Benefits | Non-U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	15.3	18.1
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	15.3	18.1
U.S. Pension Benefits | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.9	0.8
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.9	0.8
U.S. Pension Benefits | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Other securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	9.8	5.4
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	9.8	5.4
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	146.8	141.9	132.5
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	4.3	3.5
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	142.5	138.4
Non-U.S. Pension Benefits | Cash, including money market funds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	4.3	3.5
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	4.3	3.5
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	9.3	8.4
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	9.3	8.4
Non-U.S. Pension Benefits | Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	34.4	35.0
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	34.4	35.0
Non-U.S. Pension Benefits | U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	1.1	1.0
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	1.1	1.0
Non-U.S. Pension Benefits | Non-U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	29.8	28.0
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	29.8	28.0
Non-U.S. Pension Benefits | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.6	0.1
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.6	0.1
Non-U.S. Pension Benefits | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	44.2	42.7
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	44.2	42.7
Non-U.S. Pension Benefits | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	8.8	9.0
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	8.8	9.0
Non-U.S. Pension Benefits | Other securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	14.3	14.2
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0	0
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	$ 14.3	$ 14.2