Employee Benefits (Details) employee in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Number of Fixed Income Funds Investing in Debt Securities Ecured by Royalty Payments [Line Items]
Number of employees sponsored by defined benefit pension plans | employee	10
Profit Sharing Bonus	$ 5.5
Defined Contribution Plan, Employer Discretionary Contribution Amount	4.7	$ 2.1	$ 0.0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,355.2	1,188.8
Service cost	4.6	4.3	4.3
Interest cost	57.2	60.7	56.2
Benefits paid	(151.9)	(101.1)
Actuarial loss	(60.2)	214.1
Expenses paid from assets	(5.8)	(11.3)
Other	3.6	(0.3)
Benefit obligation at year end	1,202.7	1,355.2	1,188.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets beginning of year	899.3	808.4
Actual return on plan assets	56.6	141.6
Employer contributions	70.9	62.3
Benefits paid	(151.9)	(101.1)
Expenses paid from assets	(5.8)	(11.3)
Other	(2.0)	(0.6)
Fair value of plan assets at year end	867.1	899.3	808.4
Funded status at year end	(335.6)	(455.9)
Settlements, plan assets	85.2
Noncurrent assets	1.3	1.9
Current liabilities	0.7	0.4
Noncurrent liabilities	336.2	457.4
Net actuarial loss	406.0	502.7
Unrecognized actuarial losses net of tax	367.7
Actuarial loss included in accumulated other comprehensive income and expected to be recognized next year	13.2
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	1,202.2	1,353.6
Pension Settlement Charge	$ 28.7	$ 0.0	$ 0.0