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Fair Value of Pension Plan Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets $ 508.1 $ 497.4
Balance at beginning of period 88.3 85.0
Actual return on plan assets:    
Assets sold during the year 0.6 0
Assets still held at year end (0.8) 0.9
Net purchases, sales and settlements (26.0) 2.4
Balance at end of period 62.1 88.3
Level 1
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 62.4 50.9
Level 2
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 383.6 358.2
Level 3
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 62.1 88.3
Investment funds
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 406.7 398.4
Balance at beginning of period 48.2 43.8
Actual return on plan assets:    
Assets sold during the year 0.6 0
Assets still held at year end 1.9 2.2
Net purchases, sales and settlements (25.3) 2.2
Balance at end of period 25.4 48.2
Investment funds | Level 1
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 22.2 22.3
Investment funds | Level 2
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 359.1 327.9
Investment funds | Level 3
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 25.4 48.2
Insurance contracts
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 22.0 24.8
Insurance contracts | Level 1
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 0 0
Insurance contracts | Level 2
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 22.0 24.8
Insurance contracts | Level 3
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 0 0
Limited partnerships
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 36.1 39.8
Balance at beginning of period 39.8 41.1
Actual return on plan assets:    
Assets sold during the year 0 0
Assets still held at year end (2.9) (1.3)
Net purchases, sales and settlements (0.8) 0
Balance at end of period 36.1 39.8
Limited partnerships | Level 1
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 0 0
Limited partnerships | Level 2
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 0 0
Limited partnerships | Level 3
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 36.1 39.8
Other plan assets
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 43.3 34.4
Balance at beginning of period 0.3 0.1
Actual return on plan assets:    
Assets sold during the year 0 0
Assets still held at year end 0.2 0
Net purchases, sales and settlements 0.1 0.2
Balance at end of period 0.6 0.3
Other plan assets | Level 1
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 40.2 28.6
Other plan assets | Level 2
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets 2.5 5.5
Other plan assets | Level 3
    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Fair Value of Plan Assets $ 0.6 $ 0.3