Pension and Other Post-Retirement Benefits (Details 8) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair value of pension plan assets
Assets	$ 413.5	$ 416.1
Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	3.1	14.2
Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	0.0	0.0
Short-term investment funds [Member]
Fair value of pension plan assets
Assets	3.1	1.6
Short-term investment funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	3.1	1.6
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	210.4	190.4
Fixed income collective trust funds [Member]
Fair value of pension plan assets
Assets	151.4	160.4
Real estate investment funds [Member]
Fair value of pension plan assets
Assets	18.7	20.2
Loan Fund [Member]
Fair value of pension plan assets
Assets	$ 29.9	30.9
UNITED STATES | Common stock [Member]
Fair value of pension plan assets
Assets		11.4
UNITED STATES | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets		11.4
International [Member] | Common stock [Member]
Fair value of pension plan assets
Assets		1.2
International [Member] | Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets		$ 1.2