Pension and Other Post-Retirement Benefits (Details 8) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Fair value of pension plan assets
Assets	$ 416.1	$ 456.9
Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	14.2	15.8
Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	401.9	441.1
Short-term investment funds [Member]
Fair value of pension plan assets
Assets	1.6	0.9
Short-term investment funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	1.6	0.9
Short-term investment funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	$ 0.0	$ 0.0
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 collective funds [Member]
Fair value of pension plan assets
Assets	$ 190.4	$ 215.2
Common stock collective funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0.0	0.0
Common stock collective funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	190.4	215.2
Fixed income collective trust funds [Member]
Fair value of pension plan assets
Assets	160.4	177.8
Fixed income collective trust funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0.0	0.0
Fixed income collective trust funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	160.4	177.8
Real estate investment funds [Member]
Fair value of pension plan assets
Assets	20.2	17.9
Real estate investment funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0.0	0.0
Real estate investment funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	20.2	17.9
Loan Fund [Member]
Fair value of pension plan assets
Assets	30.9	30.2
Loan Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0.0	0.0
Loan Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	30.9	30.2
UNITED STATES | Common stock [Member]
Fair value of pension plan assets
Assets		13.3
UNITED STATES | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	11.4	13.3
International [Member] | Common stock [Member]
Fair value of pension plan assets
Assets		1.6
International [Member] | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	$ 1.2	$ 1.6