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Employee Benefit Plans - Fair Value of Investment Categories (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
U.S. Qualified Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 1,619.9 $ 0.0
Percentage of Plan Assets 100.00%  
U.S. Qualified Plans | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 431.6  
U.S. Qualified Plans | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 1,188.3  
U.S. Qualified Plans | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 34.3  
Percentage of Plan Assets 2.10%  
U.S. Qualified Plans | Cash and Cash Equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
U.S. Qualified Plans | Cash and Cash Equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 34.3  
U.S. Qualified Plans | Cash and Cash Equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | S&P 500 Futures    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.7  
Percentage of Plan Assets 0.00%  
U.S. Qualified Plans | Equity | U.S. large companies | S&P 500 Futures | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.7  
U.S. Qualified Plans | Equity | U.S. large companies | S&P 500 Futures | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | S&P 500 Futures | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | Growth    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 91.4  
Percentage of Plan Assets 5.60%  
U.S. Qualified Plans | Equity | U.S. large companies | Growth | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 91.4  
U.S. Qualified Plans | Equity | U.S. large companies | Growth | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | Growth | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | Value    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 88.2  
Percentage of Plan Assets 5.40%  
U.S. Qualified Plans | Equity | U.S. large companies | Value | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 88.2  
U.S. Qualified Plans | Equity | U.S. large companies | Value | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. large companies | Value | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. Small Companies | Value    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 27.1  
Percentage of Plan Assets 1.70%  
U.S. Qualified Plans | Equity | U.S. Small Companies | Value | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 27.1  
U.S. Qualified Plans | Equity | U.S. Small Companies | Value | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | U.S. Small Companies | Value | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | International | Growth    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 66.1  
Percentage of Plan Assets 4.10%  
U.S. Qualified Plans | Equity | International | Growth | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 66.1  
U.S. Qualified Plans | Equity | International | Growth | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | International | Growth | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Equity | International | Value    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 65.9  
Percentage of Plan Assets 4.10%  
U.S. Qualified Plans | Equity | International | Value | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
U.S. Qualified Plans | Equity | International | Value | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 65.9  
U.S. Qualified Plans | Equity | International | Value | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
U.S. Qualified Plans | Global long-term debt instruments    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 1,246.2  
Percentage of Plan Assets 76.90%  
U.S. Qualified Plans | Global long-term debt instruments | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 158.1  
U.S. Qualified Plans | Global long-term debt instruments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 1,088.1  
U.S. Qualified Plans | Global long-term debt instruments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 1,203.8 $ 0.0
Percentage of Plan Assets 100.00%  
UK Plans | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 363.5  
UK Plans | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 744.5  
UK Plans | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 95.8  
UK Plans | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 32.8  
Percentage of Plan Assets 2.70%  
UK Plans | Cash and Cash Equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 32.8  
UK Plans | Cash and Cash Equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Cash and Cash Equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Government    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 260.3  
Percentage of Plan Assets 21.60%  
UK Plans | Government | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 260.3  
UK Plans | Government | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Government | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Government and credit - commingled funds    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 210.8  
Percentage of Plan Assets 17.50%  
UK Plans | Government and credit - commingled funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Government and credit - commingled funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 210.8  
UK Plans | Government and credit - commingled funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Illiquid credit    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 55.2  
Percentage of Plan Assets 4.60%  
UK Plans | Illiquid credit | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Illiquid credit | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Illiquid credit | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 55.2  
UK Plans | Equity    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 20.8  
Percentage of Plan Assets 1.70%  
UK Plans | Equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 20.8  
UK Plans | Equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Equity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Interest rate    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 13.1  
Percentage of Plan Assets 1.10%  
UK Plans | Interest rate | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Interest rate | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 13.1  
UK Plans | Interest rate | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Currencies    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ (1.6)  
Percentage of Plan Assets (0.10%)  
UK Plans | Currencies | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Currencies | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets (1.6)  
UK Plans | Currencies | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 40.6  
Percentage of Plan Assets 3.40%  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period 60 days  
UK Plans | Hedge Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Hedge Funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Hedge Funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 40.6  
UK Plans | Diversified Multi-Asset Funds, Risk Parity    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 235.2  
Percentage of Plan Assets 19.50%  
UK Plans | Diversified Multi-Asset Funds, Risk Parity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0  
UK Plans | Diversified Multi-Asset Funds, Risk Parity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 235.2  
UK Plans | Diversified Multi-Asset Funds, Risk Parity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.0  
UK Plans | Diversified Multi-Asset Funds, Dynamic Asset Allocation    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 336.6  
Percentage of Plan Assets 28.00%  
UK Plans | Diversified Multi-Asset Funds, Dynamic Asset Allocation | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 49.6  
UK Plans | Diversified Multi-Asset Funds, Dynamic Asset Allocation | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 287.0  
UK Plans | Diversified Multi-Asset Funds, Dynamic Asset Allocation | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0