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Estimated net loss and prior service credit (Details 4) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, amortization of net gains (losses) | $ (6.2)
Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, amortization of net gains (losses) | (1.5)
Defined benefit plan, amortization of net prior service cost (credit) | $ (1.4)

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