Post Employment Plans - Fair Value of Pension Plan Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 28, 2014	Dec. 18, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 99.6	$ 107.3
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	98.8
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.8	0.7
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	20.8
Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	20.8
Equities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Equities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	48.3
Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	48.3
Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Bonds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.8
Property [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Property [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Property [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.8
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.1
Cash [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.1
Cash [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Cash [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Absolute return fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	29.6
Absolute return fund [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	29.6
Absolute return fund [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Absolute return fund [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0