Pension and Other Post-Retirement Benefits (Details 8) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair value of pension plan assets
Assets	$ 447.8
Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	25.1	409.1
Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	422.7	11.3
Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets		397.8
Short-term investment funds [Member]
Fair value of pension plan assets
Assets	1.3
Short-term investment funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	1.3	1.0
Short-term investment funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	0	1.0
Short-term investment funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets		0
Common stock [Member]
Fair value of pension plan assets
Assets
Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets
Common stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets
Common stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets
Common stock collective funds [Member]
Fair value of pension plan assets
Assets	263.0
Common stock collective funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	245.0
Common stock collective funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	263.0	0
Common stock collective funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets		245.0
Fixed income collective trust funds [Member]
Fair value of pension plan assets
Assets	138.0
Fixed income collective trust funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	131.2
Fixed income collective trust funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	138.0	0
Fixed income collective trust funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets		131.2
Real estate investment funds [Member]
Fair value of pension plan assets
Assets	21.7
Real estate investment funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	21.6
Real estate investment funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	21.7	0
Real estate investment funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets		21.6
UNITED STATES | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	21.4	8.7
International [Member] | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	$ 2.4	$ 1.6