Pensions and Other Postretirement Benefits - Additional Disclosures (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) plans	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 1,226,200,000	$ 1,353,300,000	$ 1,226,200,000	$ 1,353,300,000
Estimated pension expense			15,000,000
Multiemployer Plan
Multiemployer plans, plan contributions			2,100,000	2,800,000
Multiemployer withdrawal liability	$ 30,500,000	30,900,000	$ 30,500,000	30,900,000
Number of multiemployer plans | plans			3
Charges related to partial withdrawal from multiemployer plan			$ 0	4,300,000	$ 1,500,000
Percent of total plan contributions for the most recent plan year	5.00%		5.00%
Defined Contribution Plans
Contributions to defined contribution plans			$ 29,000,000	28,900,000	$ 27,900,000
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Settlement, reduction in projected benefit obligation	$ 34,700,000	42,000,000	61,100,000	40,200,000
Cash payment from existing plan assets	$ 34,600,000	40,200,000	61,100,000	40,200,000
Settlement charge		$ 800,000
Company's contributions to its pension plans			53,400,000	52,200,000
Benefit payments made			55,900,000	52,500,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement, reduction in projected benefit obligation			0	0
Cash payment from existing plan assets			0	0
Company's contributions to its pension plans			2,800,000	2,200,000
Benefit payments made			2,800,000	$ 2,200,000
Expected contributions in 2016			$ 3,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation horizon term			3 years
Minimum | Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions in 2016			$ 50,000,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation horizon term			5 years
Maximum | Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions in 2016			$ 60,000,000